diff --git a/common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsPlatform.java b/common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsPlatform.java
index d878aadb..a7160e5b 100644
--- a/common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsPlatform.java
+++ b/common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsPlatform.java
@@ -71,7 +71,7 @@ import java.util.logging.Logger;
 
 public interface ViaBackwardsPlatform {
 
-    String MINIMUM_VV_VERSION = "5.1.1";
+    String MINIMUM_VV_VERSION = "5.1.2";
 
     /**
      * Initialize ViaBackwards.
diff --git a/common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriterBase.java b/common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriterBase.java
index a0c6be46..cadd29c4 100644
--- a/common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriterBase.java
+++ b/common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriterBase.java
@@ -240,7 +240,7 @@ public abstract class EntityRewriterBase<C extends ClientboundPacketType, T exte
     }
 
     protected PacketHandler getTrackerHandler(EntityType entityType) {
-        return wrapper -> tracker(wrapper.user()).addEntity((int) wrapper.get(Types.VAR_INT, 0), entityType);
+        return wrapper -> tracker(wrapper.user()).addEntity(wrapper.get(Types.VAR_INT, 0), entityType);
     }
 
     protected PacketHandler getPlayerTrackerHandler() {
diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/v1_13to1_12_2/rewriter/PlayerPacketRewriter1_13.java b/common/src/main/java/com/viaversion/viabackwards/protocol/v1_13to1_12_2/rewriter/PlayerPacketRewriter1_13.java
index 79581b75..602a29b8 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/v1_13to1_12_2/rewriter/PlayerPacketRewriter1_13.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/v1_13to1_12_2/rewriter/PlayerPacketRewriter1_13.java
@@ -469,7 +469,7 @@ public class PlayerPacketRewriter1_13 extends RewriterBase<Protocol1_13To1_12_2>
                     wrapper.write(Types.STRING, newChannel);
 
                     if (newChannel.equals("minecraft:register") || newChannel.equals("minecraft:unregister")) {
-                        String[] channels = new String(wrapper.read(Types.REMAINING_BYTES), StandardCharsets.UTF_8).split("\0");
+                        String[] channels = new String(wrapper.read(Types.SERVERBOUND_CUSTOM_PAYLOAD_DATA), StandardCharsets.UTF_8).split("\0");
                         List<String> rewrittenChannels = new ArrayList<>();
                         for (String s : channels) {
                             String rewritten = ItemPacketRewriter1_13.getNewPluginChannelId(s);
@@ -480,7 +480,7 @@ public class PlayerPacketRewriter1_13 extends RewriterBase<Protocol1_13To1_12_2>
                             }
                         }
                         if (!rewrittenChannels.isEmpty()) {
-                            wrapper.write(Types.REMAINING_BYTES, Joiner.on('\0').join(rewrittenChannels).getBytes(StandardCharsets.UTF_8));
+                            wrapper.write(Types.SERVERBOUND_CUSTOM_PAYLOAD_DATA, Joiner.on('\0').join(rewrittenChannels).getBytes(StandardCharsets.UTF_8));
                         } else {
                             wrapper.cancel();
                         }
diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_2to1_21/rewriter/BlockItemPacketRewriter1_21_2.java b/common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_2to1_21/rewriter/BlockItemPacketRewriter1_21_2.java
index aa4a4410..3b58cf1f 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_2to1_21/rewriter/BlockItemPacketRewriter1_21_2.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_2to1_21/rewriter/BlockItemPacketRewriter1_21_2.java
@@ -38,6 +38,7 @@ import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPacke
 import com.viaversion.viaversion.rewriter.BlockRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.util.Key;
+import com.viaversion.viaversion.util.Limit;
 
 import static com.viaversion.viaversion.protocols.v1_21to1_21_2.rewriter.BlockItemPacketRewriter1_21_2.downgradeItemData;
 import static com.viaversion.viaversion.protocols.v1_21to1_21_2.rewriter.BlockItemPacketRewriter1_21_2.updateItemData;
@@ -143,7 +144,7 @@ public final class BlockItemPacketRewriter1_21_2 extends BackwardsStructuredItem
             wrapper.passthrough(Types.SHORT); // Slot
             wrapper.passthrough(Types.BYTE); // Button
             wrapper.passthrough(Types.VAR_INT); // Mode
-            final int length = wrapper.passthrough(Types.VAR_INT);
+            final int length = Limit.max(wrapper.passthrough(Types.VAR_INT), 128);
             for (int i = 0; i < length; i++) {
                 wrapper.passthrough(Types.SHORT); // Slot
                 passthroughServerboundItem(wrapper);
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 10364b62..f8118301 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -3,7 +3,7 @@ metadata.format.version = "1.1"
 [versions]
 
 # ViaVersion
-viaver = "5.1.1"
+viaver = "5.1.2-SNAPSHOT"
 
 # Common provided
 netty = "4.0.20.Final"