Currently, in 4.22.3 it’s very unstable, crashes a LOT randomly (and after with a couple of CTRL+Z always). Additionally the already created prefab of prefabs will be empty after you restart the editor and the collections or nested prefabs aren’t spawning (with “Spawn Prefab” function) in packeged builds or in Standalone Game at all because of something (they are only works in editor).
The Randomize function don’t do anything in packeged builds too if you place some randomize-able prefab to a scene, so sadly, in it’s current state it’s unusable… : (