This bug has been ongoing for a long time now. I think I didn't address this bug properly before. I'm not even sure as well if anyone else has already brought this issue up before. Anyway, if you use an avatar 3.0 with animations while sitting on a chair, your animations starts to bug. This only happens when a station doesn't have an animator in it.
What I find is that during an animation, any particle effects, sounds and probably other components that are controlled by animation will only play the first frame repetitively for the entire duration of the animation state. When transitioning to another state, the same animation bug will happen again.
Because of this bug, this might introduce a variety of symptoms such as lag when an avatar (with lots of complex animations) is sitting on a station that doesn't have an assigned animator.
So far, one possibly way to prevent such bug from happening is to assign an animator on a station. Another possible way also is to just change to an avatar that have little to no animations.
I hope the devs would fix this issue.
If you want to test this animation bug, just find a world or avatar that has a station in it. There's a pretty good chance that it doesn't have an animator assigned on that station.
Note: I'm not good on how to word things out. So please bear with me.