Refs to prefabs within prefabs getting lost

I’m seeing some cases where refs to prefabs are being lost in cocos creator 3.8.1. The UI looks like they’re setup correctly, but when you hit play, the references are cleared.
This video shows:

  1. ref to RootPrefab seems to work fine (00:11) :+1:
  2. ref to ChildPrefab (prefab within a prefab) breaks with red Missing Node message (00:22) :interrobang:
  3. ref child Node in prefab just gets cleared (00:36) :interrobang:

I see other cases of prefabs losing connections, like this:

but seems like that one was marked fixed, and I think that made it into 3.8.1 (but not certain)