Identity.combine(other) should just return other.

src/main/java/com/sk89q/worldedit/math/transform/Identity.java

@@ -41,7 +41,7 @@ public Transform combine(Transform other) {
         if (other instanceof Identity) {
             return this;
         } else {
-            return new CombinedTransform(this, other);
+            return other;
         }
     }
 }