Fixed(?): Black screen when swiping post closed bug resolved after Samsung's One UI 6.1 update
When Samsung last updated One UI several months ago, myself and many other Samsung users (and Pixel users on Android 14 as well, judging by the replies) encountered a bug where swiping posts closed showed only a black background until fully closed, after which the content one would expect to see would appear.
Last night, One UI updated to 6.1 on my device, and when I used Sync this morning, I noticed that the black background bug is no longer happening.
!Unfortunately I now need to re-learn my navigation gestures because Samsung apparently thinks it's fine to force people to completely re-learn how they navigate their phone overnight...!<