"Cyclic prefab nesting not supported" when adding a sibling to a prefab

Hey there, I noticed a new problem that appeared when I upgraded to 2022.1 beta. Repro is very simple:

  1. Create a prefab called “Parent”
  2. Create two prefab variants out of Parent called “ChildA” and “ChildB”
  3. Open ChildA (edit the prefab) and try to add ChildB as an instance

When I do this, I get the message: “Cyclic prefab nesting not supported”. I see how I can’t add ChildA to ChildA (or any descendants of ChildA), but I’d expect to be able to add siblings and ascendants of ChildA.

Still a problem in 2022.1.0b3. I was going to file a bug report, but noticed there was one here (Issue ID 1395865).

Hi @Ollhax ,

Thanks for bringing this to our attention. The case was opened yesterday after investigating your lead here. The devs will look into it.

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it still doesn’t work please fix

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I have a similar problem when trying to follow a Lego Tutorial “Activate the Elevator”, when you drag the Elevator Behaviour Brick into the Scene view.