I am also experiencing the same issue with animations not loading properly. I think it has something to do with having different groupings in a model. It will load the animation for a which is under the first group, but will not load anything connected to the parts under it.
So here, the Torso will be animated but it will not load for any of the parts connected to the torso since they are under a different group than the main motor6D.
Using a folder instead of a model does work though.
There was a change that changed animator joint search to stop at the first descendant model. Looks like affected games had inner models expected to be animated by the outer Model’s animator.
Reverting the flag and changing the behavior for the next iteration.
How long will it be until the next iteration? By this do you mean the next patch update, which means around in the next upcoming week or two? Also thank you for clarifying the issue.