I use PIP regularly on my MacBook Air M1, and I noticed some frustrating behavior: if the PIP window is too small, the Subtitles button that can be used to control the subtitles simply disappears. No right click menu, no overflow menu, nothing. Just gone. This really should be reconsidered, especially since it seems to be extremely sensitive and hide the button even when there's plenty of space for it. This behavior is terrible for accessibility.
Here's an example where I show approximately the smallest window size that still shows the button, compared to the biggest window size that hides it:
https://imgur.com/a/BDRMW2o
