[XJENSEN]

I already found the cause! If any other track in the session has a User Offset, the frozen folder track starts to play out of sync by that amount.

So it's not a problem with the Freeze function, but rather with the delay compensation of the frozen folder track (not a frozen track in general, because my frozen click track plays fine).

Definitely a bug they overlooked. I will report it to Avid.

EDIT: Reported as case 03916895.

Additionally, the workaround to instead commit the track also fails, and the audio is placed too early on the timeline. This only happens for folder tracks. Other tracks in the session commit and freeze fine.