Yes, I’m using a using a joint chain driven by a physics asset for the hair, so it’s definitely not related to cloth in my case. Jiggle physics don’t work for me either, you can just barely see it on the character’s chest in the gif. I should probably make another recording in a “real” environment, since the problems are much more pronounced there.
There was a similar problem back in 4.8, but it was fixed in the following release. Maybe this is related? Physics Problems with Ponytail - Physics - Unreal Engine Forums