Humanoids seem to have this issue with the Adaptive physics mode, which is a relatively new feature, even without the legacy/deprecated movers. They don’t seem to like being run at lower than 240hz. I don’t think this issue exists with the newer ControllerManager paradigm.
I believe you’ve been seeing this more recently because Adaptive has been set as the default on all the Templates, so any new games will be using it. It hasn’t been retroactively applied to games that haven’t already opted-in, however.