This bug occurs inconsistently on all games. Reproducing is as simple as joining a game or starting a studio session and hope to see that it just occurs.
Weirdly, there are no errors in the output or developer console. I started noticing this happening 2-3 days ago. The likeliness of this to occur is once every 30 games I suppose. However I think this may have something to do with games loading quickly which doesn’t give the topbar enough time to initialize.
We have turned on a speculative fix to this issue with the new release, please let me know if anyone sees this after updating to the most recent client.