Update for MC 1.21.2 mappings

Changes taken from gnembon/carpet-extra#333

src/main/java/carpetabp/utils/BlockPlacer.java

@@ -10,7 +10,7 @@
 import net.minecraft.block.enums.ComparatorMode;
 import net.minecraft.block.enums.SlabType;
 import net.minecraft.item.ItemPlacementContext;
-import net.minecraft.state.property.DirectionProperty;
+import net.minecraft.state.property.EnumProperty;
 import net.minecraft.state.property.Properties;
 import net.minecraft.state.property.Property;
 import net.minecraft.util.math.BlockPos;
@@ -31,7 +31,7 @@ public static BlockState alternativeBlockPlacement(Block block, ItemPlacementCon
 
         // It would be nice if relativeHitX was adjusted in context to original range from 0.0 to 1.0,
         // since some blocks are actually using it.
-        DirectionProperty directionProp = getFirstDirectionProperty(state);
+        EnumProperty<Direction> directionProp = getFirstDirectionProperty(state);
         int protocolValue = ((int) relativeHitX - 2) / 2;
 
         if (directionProp != null)
@@ -110,14 +110,18 @@ else if (state.contains(Properties.SLAB_TYPE) &&
         return state;
     }
 
+    @SuppressWarnings("unchecked")
     @Nullable
-    public static DirectionProperty getFirstDirectionProperty(BlockState state)
+    public static EnumProperty<Direction> getFirstDirectionProperty(BlockState state)
     {
         for (Property<?> prop : state.getProperties())
         {
-            if (prop instanceof DirectionProperty)
+            if (prop instanceof EnumProperty<?> enumProperty)
             {
-                return (DirectionProperty) prop;
+                if (enumProperty.getType().equals(Direction.class))
+                {
+                    return (EnumProperty<Direction>) enumProperty;
+                }
             }
         }