So, coming back to this, I had time to test it with a new project today. I have to admit that it doesn’t work.
However, we do have one project with a child AnimBP with the steps as I described, and it works there with the existing child AnimBP, but not with new child AnimBPs…? The project was created with 4.24.0 I think and maybe it broke with .1 or later subrevisions.
As a workaround, you can expose the Animations as variables in the parent AnimBP:
Then create a child AnimBP and change the Skeleton in the Class Settings as described in my first post, but instead of using the (broken?!) Asset Override Editor change the value of the variables.
It is one step more, but at least you don’t have to remake the whole AnimBP.
Let me know if this workaround works for you, please.