If you have, could you share your groups.yaml here so I can compare it?
I haven’t been able to find a post referencing it that says they were successful in saving any group changes and there’s an issue in for it, but no one seems to be looking into it.
Just seems weird to introduce a new feature in 0.39, have it not work for anyone (as far as I can tell) and not address it at all, even if just to ask for more info or logs…