worldedit-core/src/main/java/com/fastasyncworldedit/core/registry/state/PropertyKey.java

@@ -137,4 +137,9 @@ public class PropertyKey implements Comparable<PropertyKey> {
         return Integer.compare(this.id, o.id);
     }
 
+    @Override
+    public String toString() {
+        return "PropertyKey[" + getName() + "]";
+    }
+
 }

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/BlockState.java

@@ -351,7 +351,7 @@ public class BlockState implements BlockStateHolder<BlockState>, Pattern {
         BlockState newState = this;
         for (Property<?> prop : ot.getProperties()) {
             PropertyKey key = prop.getKey();
-            if (blockType.hasProperty(key)) {
+            if (blockType.hasPropertyOfType(key, prop.getClass())) {
                 newState = newState.with(key, other.getState(key));
             }
         }

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/BlockType.java

@@ -247,6 +247,21 @@ public class BlockType implements Keyed, Pattern {
         return this.settings.propertiesMapArr.length > ordinal && this.settings.propertiesMapArr[ordinal] != null;
     }
 
+    /**
+     * {@return whether this block type has a property with given key of the given type}
+     *
+     * @param key          the key identifying the property
+     * @param propertyType the expected type of the property
+     * @since TODO
+     */
+    public boolean hasPropertyOfType(PropertyKey key, Class<?> propertyType) {
+        int ordinal = key.getId();
+        Property<?> property;
+        return this.settings.propertiesMapArr.length > ordinal
+                && (property = this.settings.propertiesMapArr[ordinal]) != null
+                && property.getClass() == propertyType;
+    }
+
     public <V> Property<V> getProperty(PropertyKey key) {
         try {
             return (Property<V>) this.settings.propertiesMapArr[key.getId()];