Paper/patch-remap/mache-spigotflower-stripped/net/minecraft/network/protocol/game/ClientboundSectionBlocksUpdatePacket.java.patch

--- a/net/minecraft/network/protocol/game/ClientboundSectionBlocksUpdatePacket.java
+++ b/net/minecraft/network/protocol/game/ClientboundSectionBlocksUpdatePacket.java
@@ -30,14 +30,18 @@
             short short0 = (Short) shortiterator.next();
 
             this.positions[j] = short0;
-            this.states[j] = levelchunksection.getBlockState(SectionPos.sectionRelativeX(short0), SectionPos.sectionRelativeY(short0), SectionPos.sectionRelativeZ(short0));
+            this.states[j] = (section != null) ? section.getBlockState(SectionPos.sectionRelativeX(short0), SectionPos.sectionRelativeY(short0), SectionPos.sectionRelativeZ(short0)) : net.minecraft.world.level.block.Blocks.AIR.defaultBlockState(); // CraftBukkit - SPIGOT-6076, Mojang bug when empty chunk section notified
         }
 
     }
 
-    public ClientboundSectionBlocksUpdatePacket(FriendlyByteBuf friendlybytebuf) {
-        this.sectionPos = SectionPos.of(friendlybytebuf.readLong());
-        int i = friendlybytebuf.readVarInt();
+    // CraftBukkit start - Add constructor
+    public ClientboundSectionBlocksUpdatePacket(SectionPos sectionposition, ShortSet shortset, IBlockData[] states) {
+        this.sectionPos = sectionposition;
+        this.positions = shortset.toShortArray();
+        this.states = states;
+    }
+    // CraftBukkit end
 
         this.positions = new short[i];
         this.states = new BlockState[i];