Z Fold 8 Ultra reduces TikTok Volume in background

2 issues with the TikTok app on the Z Fold 8 Ultra:

1. When I watch a live and swipe away to run it in the background, it switches to audio only mode. But the audio volume reduces quite a bit.

2. I can get PiP for regular TT videos but not lives. I don't usually consume the app this way but was going to test it to resolve issue 1.

Is this a known issue for the Galaxy devices or Android? Other apps seem to work as expected - e.g., YouTube.