I have a station on my Avatar 3.0 with an animator override that scales their size to 0.25 along with a VRC Animator Tracking Control component, "Animations" all enabled to fix a pose. When someone with Avatar 3.0 sits and gets off the station, their visemes/blendshape are frozen to its last position and their scale is not reset. Often, but not always, people are stuck with a large scaling. This is an awfully specific/niche bug but I was advised to report this issue.