diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/Protocol1_20_5To1_20_3.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/Protocol1_20_5To1_20_3.java
index 6023368d1..6d4d63f0e 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/Protocol1_20_5To1_20_3.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/Protocol1_20_5To1_20_3.java
@@ -18,8 +18,6 @@
 package com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3;
 
 import com.viaversion.viaversion.api.connection.UserConnection;
-import com.viaversion.viaversion.api.data.MappingData;
-import com.viaversion.viaversion.api.data.MappingDataBase;
 import com.viaversion.viaversion.api.minecraft.RegistryType;
 import com.viaversion.viaversion.api.minecraft.data.StructuredDataKey;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_20_5;
@@ -40,6 +38,7 @@ import com.viaversion.viaversion.protocols.protocol1_20_3to1_20_2.packet.Clientb
 import com.viaversion.viaversion.protocols.protocol1_20_3to1_20_2.packet.ClientboundPackets1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_3to1_20_2.packet.ServerboundPacket1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_3to1_20_2.packet.ServerboundPackets1_20_3;
+import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.MappingData;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.packet.ClientboundConfigurationPackets1_20_5;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.packet.ClientboundPacket1_20_5;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.packet.ClientboundPackets1_20_5;
@@ -56,7 +55,7 @@ import static com.viaversion.viaversion.util.ProtocolUtil.packetTypeMap;
 
 public final class Protocol1_20_5To1_20_3 extends AbstractProtocol<ClientboundPacket1_20_3, ClientboundPacket1_20_5, ServerboundPacket1_20_3, ServerboundPacket1_20_5> {
 
-    public static final MappingData MAPPINGS = new MappingDataBase("1.20.3", "1.20.5");
+    public static final MappingData MAPPINGS = new MappingData();
     private final EntityPacketRewriter1_20_5 entityRewriter = new EntityPacketRewriter1_20_5(this);
     private final BlockItemPacketRewriter1_20_5 itemRewriter = new BlockItemPacketRewriter1_20_5(this);
     private final TagRewriter<ClientboundPacket1_20_3> tagRewriter = new TagRewriter<>(this);
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/MappingData.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/MappingData.java
new file mode 100644
index 000000000..313a684a8
--- /dev/null
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/MappingData.java
@@ -0,0 +1,52 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data;
+
+import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.github.steveice10.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.api.data.MappingDataBase;
+import com.viaversion.viaversion.api.data.MappingDataLoader;
+import java.util.ArrayList;
+import java.util.List;
+
+public class MappingData extends MappingDataBase {
+
+    private final List<String> itemIds = new ArrayList<>();
+
+    public MappingData() {
+        super("1.20.3", "1.20.5");
+    }
+
+    @Override
+    protected void loadExtras(final CompoundTag data) {
+        super.loadExtras(data);
+
+        final CompoundTag items = MappingDataLoader.loadNBT("itemIds-1.20.3.nbt");
+        for (final StringTag tag : items.getListTag("items", StringTag.class)) {
+            itemIds.add(tag.getValue());
+        }
+    }
+
+    public int itemId(final String name) {
+        return itemIds.indexOf(name);
+    }
+
+    public String itemName(final int id) {
+        return itemIds.get(id);
+    }
+}
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java
index ea6c58eee..6ff00465a 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java
@@ -40,6 +40,7 @@ import com.viaversion.viaversion.api.minecraft.item.data.ArmorTrimPattern;
 import com.viaversion.viaversion.api.minecraft.item.data.AttributeModifier;
 import com.viaversion.viaversion.api.minecraft.item.data.AttributeModifiers;
 import com.viaversion.viaversion.api.minecraft.item.data.BannerPatternLayer;
+import com.viaversion.viaversion.api.minecraft.item.data.Bee;
 import com.viaversion.viaversion.api.minecraft.item.data.BlockStateProperties;
 import com.viaversion.viaversion.api.minecraft.item.data.DyedColor;
 import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
@@ -91,7 +92,7 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<ClientboundPacket1_20_3, ServerboundPacket1_20_5, Protocol1_20_5To1_20_3> {
 
-    private static final String[] MOB_TAGS = {"NoAI", "Silent", "NoGravity", "Glowing", "Invulnerable", "Health", "Age", "Variant", "HuntingCooldown", "BucketVariantTag"};
+    public static final String[] MOB_TAGS = {"NoAI", "Silent", "NoGravity", "Glowing", "Invulnerable", "Health", "Age", "Variant", "HuntingCooldown", "BucketVariantTag"};
     private static final GameProfile.Property[] EMPTY_PROPERTIES = new GameProfile.Property[0];
 
     public BlockItemPacketRewriter1_20_5(final Protocol1_20_5To1_20_3 protocol) {
@@ -395,18 +396,15 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
 
         updateProfile(data, tag.get("SkullOwner"));
 
+        final CompoundTag customCreativeLock = tag.getCompoundTag("CustomCreativeLock");
+        if (customCreativeLock != null) {
+            data.set(StructuredDataKey.CREATIVE_SLOT_LOCK);
+        }
+
         // TODO
         //  StructuredDataKey.CAN_PLACE_ON
         //  StructuredDataKey.CAN_BREAK
         //  (remaining ones should only affect non-essential item tooltip, or not be shown/checked at all)
-        //  StructuredDataKey.POT_DECORATIONS
-        //  StructuredDataKey.CONTAINER
-        //  StructuredDataKey.CONTAINER_LOOT
-        //  StructuredDataKey.INTANGIBLE_PROJECTILE
-        //  StructuredDataKey.CREATIVE_SLOT_LOCK
-        //  StructuredDataKey.BEES
-        //  StructuredDataKey.LOCK
-        //  StructuredDataKey.NOTE_BLOCK_SOUND
 
         data.set(StructuredDataKey.CUSTOM_DATA, tag);
         return item;
@@ -677,11 +675,16 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
         data.set(dataKey, items);
     }
 
+    private int toItemId(final String id) {
+        final int unmappedId = protocol.getMappingData().itemId(Key.stripMinecraftNamespace(id));
+        return protocol.getMappingData().getNewItemId(unmappedId);
+    }
+
     private Item itemFromTag(final CompoundTag item) {
         final StringTag id = item.getStringTag("id");
         final NumberTag count = item.getNumberTag("Count");
         final CompoundTag tag = item.getCompoundTag("tag");
-        return handleItemToClient(new DataItem(0, count.asByte(), (short) 0, tag)); // TODO unmapped id from key
+        return handleItemToClient(new DataItem(toItemId(id.getValue()), count.asByte(), (short) 0, tag));
     }
 
     private void updateEnchantments(final StructuredDataContainer data, final CompoundTag tag, final String key,
@@ -740,6 +743,18 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
         }
     }
 
+    private void updateBees(final StructuredDataContainer data, final ListTag<CompoundTag> beesTag) {
+        final Bee[] bees = beesTag.stream().map(bee -> {
+            final CompoundTag entityData = bee.getCompoundTag("EntityData");
+            final int ticksInHive = bee.getInt("TicksInHive");
+            final int minOccupationTicks = bee.getInt("MinOccupationTicks");
+
+            return new Bee(entityData, ticksInHive, minOccupationTicks);
+        }).toArray(Bee[]::new);
+
+        data.set(StructuredDataKey.BEES, bees);
+    }
+
     private void updateProperties(final CompoundTag propertiesTag, final List<GameProfile.Property> properties) {
         for (final Map.Entry<String, Tag> entry : propertiesTag.entrySet()) {
             if (!(entry.getValue() instanceof ListTag)) {
@@ -810,9 +825,41 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
             return;
         }
 
-        final StringTag lock = tag.getStringTag("Lock");
-        if (lock != null && data != null) {
-            data.set(StructuredDataKey.LOCK, lock);
+        if (data != null) {
+            final StringTag lockTag = tag.getStringTag("Lock");
+            if (lockTag != null) {
+                data.set(StructuredDataKey.LOCK, lockTag);
+            }
+
+            final ListTag<CompoundTag> beesTag = tag.getListTag("Bees", CompoundTag.class);
+            if (beesTag != null) {
+                updateBees(data, beesTag);
+            }
+
+            final ListTag<StringTag> sherdsTag = tag.getListTag("sherds", StringTag.class);
+            if (sherdsTag != null) {
+                final String sherd1 = sherdsTag.get(0).getValue();
+                final String sherd2 = sherdsTag.get(1).getValue();
+                final String sherd3 = sherdsTag.get(2).getValue();
+                final String sherd4 = sherdsTag.get(3).getValue();
+
+                data.set(StructuredDataKey.POT_DECORATIONS, new int[]{toItemId(sherd1), toItemId(sherd2), toItemId(sherd3), toItemId(sherd4)});
+            }
+
+            final StringTag noteBlockSoundTag = tag.getStringTag("note_block_sound");
+            if (noteBlockSoundTag != null) {
+                data.set(StructuredDataKey.NOTE_BLOCK_SOUND, noteBlockSoundTag.getValue());
+            }
+
+            final StringTag lootTableTag = tag.getStringTag("LootTable");
+            if (lootTableTag != null) {
+                final long lootTableSeed = tag.getLong("LootTableSeed");
+
+                final CompoundTag containerLoot = new CompoundTag();
+                containerLoot.putString("loot_table", lootTableTag.getValue());
+                containerLoot.putLong("loot_table_seed", lootTableSeed);
+                data.set(StructuredDataKey.CONTAINER_LOOT, containerLoot);
+            }
         }
 
         final Tag skullOwnerTag = tag.remove("SkullOwner");
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java
index b5e903dfd..2a31be9cf 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java
@@ -27,15 +27,18 @@ import com.viaversion.viaversion.api.minecraft.data.StructuredData;
 import com.viaversion.viaversion.api.minecraft.data.StructuredDataKey;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.minecraft.item.data.AttributeModifier;
+import com.viaversion.viaversion.api.minecraft.item.data.Bee;
 import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
 import com.viaversion.viaversion.api.minecraft.item.data.FilterableComponent;
 import com.viaversion.viaversion.api.minecraft.item.data.FilterableString;
 import com.viaversion.viaversion.api.minecraft.item.data.FireworkExplosion;
+import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.Protocol1_20_5To1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.Attributes1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.Enchantments1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.Instruments1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.MapDecorations1_20_3;
 import com.viaversion.viaversion.util.ComponentUtil;
+import com.viaversion.viaversion.util.Key;
 import com.viaversion.viaversion.util.UUIDUtil;
 import it.unimi.dsi.fastutil.ints.Int2IntMap;
 import it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap;
@@ -220,6 +223,42 @@ final class StructuredDataConverter {
                 tag.putString("instrument", identifier);
             }
         });
+        register(StructuredDataKey.BEES, (data, tag) -> {
+            final ListTag<CompoundTag> bees = new ListTag<>(CompoundTag.class);
+            for (final Bee bee : data) {
+                final CompoundTag beeTag = new CompoundTag();
+                beeTag.put("EntityData", bee.entityData());
+                beeTag.putInt("TicksInHive", bee.ticksInHive());
+                beeTag.putInt("MinOccupationTicks", bee.minTicksInHive());
+                bees.add(beeTag);
+            }
+            getBlockEntityTag(tag).put("Bees", bees);
+        });
+        register(StructuredDataKey.LOCK, (data, tag) -> getBlockEntityTag(tag).put("Lock", data));
+        register(StructuredDataKey.NOTE_BLOCK_SOUND, (data, tag) -> getBlockEntityTag(tag).putString("note_block_sound", data));
+        register(StructuredDataKey.POT_DECORATIONS, (data, tag) -> {
+            final ListTag<StringTag> sherds = new ListTag<>(StringTag.class);
+            for (final int id : data) {
+                final int oldId = Protocol1_20_5To1_20_3.MAPPINGS.getOldItemId(id);
+                sherds.add(new StringTag(Protocol1_20_5To1_20_3.MAPPINGS.itemName(oldId)));
+            }
+            getBlockEntityTag(tag).put("sherds", sherds);
+        });
+        register(StructuredDataKey.CREATIVE_SLOT_LOCK, (data, tag) -> tag.put("CustomCreativeLock", new CompoundTag()));
+        register(StructuredDataKey.DEBUG_STICK_STATE, (data, tag) -> tag.put("DebugProperty", data));
+        register(StructuredDataKey.RECIPES, (data, tag) -> tag.put("Recipes", data));
+        register(StructuredDataKey.ENTITY_DATA, (data, tag) -> tag.put("EntityTag", data));
+        register(StructuredDataKey.BUCKET_ENTITY_DATA, (data, tag) -> {
+            for (final String mobTagName : BlockItemPacketRewriter1_20_5.MOB_TAGS) {
+                if (data.contains(mobTagName)) {
+                    tag.put(mobTagName, data.get(mobTagName));
+                }
+            }
+        });
+        register(StructuredDataKey.BLOCK_ENTITY_DATA, (data, tag) -> {
+            // Handling of previously block entity tags is done using the getBlockEntityTag method
+            tag.put("BlockEntityTag", data);
+        });
         //register(StructuredDataKey., (data, tag) -> );
 
         //TODO
@@ -228,25 +267,24 @@ final class StructuredDataConverter {
         // StructuredDataKey<PotionContents> POTION_CONTENT
         // StructuredDataKey<SuspiciousStewEffect[]> SUSPICIOUS_STEW_EFFECT
         // StructuredDataKey<ArmorTrim> TRIM
-        // StructuredDataKey<CompoundTag> DEBUG_STICK_STATE
-        // StructuredDataKey<CompoundTag> ENTITY_DATA
-        // StructuredDataKey<CompoundTag> BUCKET_ENTITY_DATA
-        // StructuredDataKey<CompoundTag> BLOCK_ENTITY_DATA
-        // StructuredDataKey<Tag> RECIPES
         // StructuredDataKey<BannerPatternLayer[]> BANNER_PATTERNS
         // StructuredDataKey<BlockStateProperties> BLOCK_STATE
-        // StructuredDataKey<int[]> POT_DECORATIONS
-        // StructuredDataKey<String> NOTE_BLOCK_SOUND
-        // StructuredDataKey<Bee[]> BEES
-        // StructuredDataKey<Tag> LOCK
         // StructuredDataKey<CompoundTag> CONTAINER_LOOT
         // StructuredDataKey<Item[]> CONTAINER
-        // StructuredDataKey<Unit> CREATIVE_SLOT_LOCK
         // StructuredDataKey<Boolean> ENCHANTMENT_GLINT_OVERRIDE
         // StructuredDataKey<Unit> INTANGIBLE_PROJECTILE
         // StructuredDataKey<Integer> MAP_POST_PROCESSING
     }
 
+    private static CompoundTag getBlockEntityTag(final CompoundTag tag) {
+        CompoundTag blockEntityTag = tag.getCompoundTag("BlockEntityTag");
+        if (blockEntityTag == null) {
+            blockEntityTag = new CompoundTag();
+            tag.put("BlockEntityTag", blockEntityTag);
+        }
+        return blockEntityTag;
+    }
+
     private static CompoundTag convertExplosion(final FireworkExplosion explosion) {
         final CompoundTag explosionTag = new CompoundTag();
         explosionTag.putInt("Type", explosion.shape());
@@ -260,8 +298,10 @@ final class StructuredDataConverter {
     private static void convertItemList(final Item[] items, final CompoundTag tag, final String key) {
         final ListTag<CompoundTag> itemsTag = new ListTag<>(CompoundTag.class);
         for (final Item item : items) {
+            final int oldId = Protocol1_20_5To1_20_3.MAPPINGS.getOldItemId(item.identifier());
+
             final CompoundTag savedItem = new CompoundTag();
-            savedItem.putString("id", "stone"); // TODO
+            savedItem.putString("id", Protocol1_20_5To1_20_3.MAPPINGS.itemName(oldId));
             savedItem.putByte("Count", (byte) item.amount());
 
             final CompoundTag itemTag = new CompoundTag();
diff --git a/common/src/main/resources/assets/viaversion/data/itemIds-1.20.3.nbt b/common/src/main/resources/assets/viaversion/data/itemIds-1.20.3.nbt
new file mode 100644
index 000000000..0f02d99b0
Binary files /dev/null and b/common/src/main/resources/assets/viaversion/data/itemIds-1.20.3.nbt differ