Clone chunk biome container

src/main/java/me/jellysquid/mods/sodium/client/world/ChunkBiomeContainerExtended.java

@@ -0,0 +1,11 @@
+package me.jellysquid.mods.sodium.client.world;
+
+import net.minecraft.world.level.chunk.ChunkBiomeContainer;
+
+public interface ChunkBiomeContainerExtended {
+    static ChunkBiomeContainer clone(ChunkBiomeContainer container) {
+        return container != null ? ((ChunkBiomeContainerExtended)container).embeddium$copy() : null;
+    }
+
+    ChunkBiomeContainer embeddium$copy();
+}

src/main/java/me/jellysquid/mods/sodium/client/world/cloned/ClonedChunkSection.java

@@ -3,6 +3,7 @@
 import it.unimi.dsi.fastutil.ints.Int2ReferenceMap;
 import it.unimi.dsi.fastutil.ints.Int2ReferenceMaps;
 import it.unimi.dsi.fastutil.ints.Int2ReferenceOpenHashMap;
+import me.jellysquid.mods.sodium.client.world.ChunkBiomeContainerExtended;
 import me.jellysquid.mods.sodium.client.world.ReadableContainerExtended;
 import me.jellysquid.mods.sodium.client.world.WorldSlice;
 import net.fabricmc.fabric.api.rendering.data.v1.RenderAttachmentBlockEntity;
@@ -86,7 +87,7 @@ public ClonedChunkSection(Level world, LevelChunk chunk, @Nullable LevelChunkSec
             }
         }
 
-        biomeData = chunk.getBiomes();
+        biomeData = ChunkBiomeContainerExtended.clone(chunk.getBiomes());
 
         this.blockData = blockData;
         this.biomeData = biomeData;

src/main/java/me/jellysquid/mods/sodium/mixin/core/world/chunk/ChunkBiomeContainerMixin.java

@@ -0,0 +1,25 @@
+package me.jellysquid.mods.sodium.mixin.core.world.chunk;
+
+import me.jellysquid.mods.sodium.client.world.ChunkBiomeContainerExtended;
+import net.minecraft.core.IdMap;
+import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.chunk.ChunkBiomeContainer;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin(ChunkBiomeContainer.class)
+public class ChunkBiomeContainerMixin implements ChunkBiomeContainerExtended {
+    @Shadow
+    @Final
+    private IdMap<Biome> biomeRegistry;
+
+    @Shadow
+    @Final
+    private Biome[] biomes;
+
+    @Override
+    public ChunkBiomeContainer embeddium$copy() {
+        return new ChunkBiomeContainer(this.biomeRegistry, this.biomes.clone());
+    }
+}