reverting that merge of mixins since it will cause havoc on the future version branches

src/main/java/carpet/mixins/StructureBlockBlockEntity_fillUpdatesMixin.java

@@ -0,0 +1,35 @@
+package carpet.mixins;
+
+import carpet.CarpetSettings;
+import net.minecraft.block.entity.StructureBlockBlockEntity;
+import net.minecraft.structure.Structure;
+import net.minecraft.structure.StructurePlacementData;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.ServerWorldAccess;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import java.util.Random;
+
+@Mixin(StructureBlockBlockEntity.class)
+public abstract class StructureBlockBlockEntity_fillUpdatesMixin
+{
+    @Redirect(method = "place", at = @At(
+            value = "INVOKE",
+            target = "Lnet/minecraft/structure/Structure;place(Lnet/minecraft/world/ServerWorldAccess;Lnet/minecraft/util/math/BlockPos;Lnet/minecraft/structure/StructurePlacementData;Ljava/util/Random;)V"
+    ))
+    private void onStructurePlacen(Structure structure, ServerWorldAccess serverWorldAccess, BlockPos pos, StructurePlacementData placementData, Random random)
+    {
+        if(!CarpetSettings.fillUpdates)
+            CarpetSettings.impendingFillSkipUpdates = true;
+        try
+        {
+            structure.place(serverWorldAccess, pos, placementData, random);
+        }
+        finally
+        {
+            CarpetSettings.impendingFillSkipUpdates = false;
+        }
+    }
+}

src/main/java/carpet/mixins/StructureBlockBlockEntity_limitsMixin.java

@@ -5,39 +5,15 @@ import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.minecraft.block.Block;
 import net.minecraft.block.entity.StructureBlockBlockEntity;
-import net.minecraft.structure.Structure;
-import net.minecraft.structure.StructurePlacementData;
-import net.minecraft.util.Identifier;
-import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.registry.Registry;
-import net.minecraft.world.ServerWorldAccess;
 import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.injection.*;
-
-import java.util.Random;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Constant;
+import org.spongepowered.asm.mixin.injection.ModifyArg;
+import org.spongepowered.asm.mixin.injection.ModifyConstant;
 
 @Mixin(StructureBlockBlockEntity.class)
-public abstract class StructureBlockBlockEntityMixin
+public abstract class StructureBlockBlockEntity_limitsMixin
 {
-    @Redirect(method = "place", at = @At(
-            value = "INVOKE",
-            target = "Lnet/minecraft/structure/Structure;place(Lnet/minecraft/world/ServerWorldAccess;Lnet/minecraft/util/math/BlockPos;Lnet/minecraft/structure/StructurePlacementData;Ljava/util/Random;)V"
-    ))
-    private void onStructurePlacen(Structure structure, ServerWorldAccess serverWorldAccess, BlockPos pos, StructurePlacementData placementData, Random random)
-    {
-        if(!CarpetSettings.fillUpdates)
-            CarpetSettings.impendingFillSkipUpdates = true;
-        try
-        {
-            structure.place(serverWorldAccess, pos, placementData, random);
-        }
-        finally
-        {
-            CarpetSettings.impendingFillSkipUpdates = false;
-        }
-    }
-
-
     @ModifyConstant(
             method = "fromTag",
             constant = @Constant(intValue = 48)

src/main/resources/carpet.mixins.json

@@ -17,7 +17,8 @@
     "BlockStateArgument_fillUpdatesMixin",
     "World_fillUpdatesMixin",
     "WorldChunk_fillUpdatesMixin",
-    "StructureBlockBlockEntityMixin",
+    "StructureBlockBlockEntity_fillUpdatesMixin",
+    "StructureBlockBlockEntity_limitsMixin",
     "UpdateStructureBlockC2SPacketMixin",
     "Structure_fillUpdatesMixin",
     "ServerPlayNetworkHandler_interactionUpdatesMixin",