Migrate Carpet Mixin names to mojang mappings

src/main/java/carpet/mixins/BlockInput_scarpetMixin.java

@@ -0,0 +1,21 @@
+package carpet.mixins;
+
+import carpet.fakes.BlockStateArgumentInterface;
+import net.minecraft.commands.arguments.blocks.BlockInput;
+import net.minecraft.nbt.CompoundTag;
+import org.jetbrains.annotations.Nullable;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin(BlockInput.class)
+public class BlockInput_scarpetMixin implements BlockStateArgumentInterface
+{
+    @Shadow @Final private @Nullable CompoundTag tag;
+
+    @Override
+    public CompoundTag getCMTag()
+    {
+        return tag;
+    }
+}