Conversations involving multiple participants, allowing collaboration and information sharing in Teams
I have not experienced this issue and was just recently upgraded to version 24004.1307.2669.7070 as part of the targeted early release.
However, I suggest possibly trying this to see if it helps. I find it annoying that the scrollbars in all of the apps disappear at all. This change will stop that from happening. It may solve this issue until MS can get it fixed.
Try turning this on - Start > Settings > Accessibility > Always show scrollbars
Hope it helps.