Here are some quick test results:
- The four corners + elsewhere tapping functionality works well here
- So we can observe similar artifacts, I suggest discussing particular videos. For example, in the following, full-screened:
https://www.youtube.com/watch?v=IPBSB1HLNLo
in "Normal" I see the speaker (in the top right corner) with him and his background flashing (along with occasionally other portions flashing, but not much). Perhaps that is similar to what you describe.
In "A2", I don't notice a pulsating effect, though I definitely appreciate the top north corners tapping functionality for an occasional refresh
In the following video (also full-screened) in "A2", I'm not certain but I sense some kind of flickering (may be it is pulsating) in the background areas (may be it's most noticeable where the color is lighter?):
https://www.youtube.com/watch?v=-eyhCTvrEtE
Does that match what you observe?
P.S. The testing was all done here on some Linux distribution.