its a doozie

src/main/java/carpet/mixins/BlockStateArgument_scarpetMixin.java

@@ -2,7 +2,7 @@ package carpet.mixins;
 
 import carpet.fakes.BlockStateArgumentInterface;
 import net.minecraft.command.argument.BlockStateArgument;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import org.jetbrains.annotations.Nullable;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
@@ -11,10 +11,10 @@ import org.spongepowered.asm.mixin.Shadow;
 @Mixin(BlockStateArgument.class)
 public class BlockStateArgument_scarpetMixin implements BlockStateArgumentInterface
 {
-    @Shadow @Final private @Nullable CompoundTag data;
+    @Shadow @Final private @Nullable NbtCompound data;
 
     @Override
-    public CompoundTag getCMTag()
+    public NbtCompound getCMTag()
     {
         return data;
     }