Yes, many have noticed this. The above link plus others have indicated (from roll 20) that it is a problem with a Google Chrome update. Interestingly this Google Chrome update also affected Brave and Firefox. I've also noticed that the icons don't appear on "our own" video icons. When anyone else Mutes or Pauses Video, I can see it (as with my mates). The icons only seem not NOT appear for ourselves. It seems strange that Chrome stops us seeing the icons for ourselves but allows for other players. Maybe I'm overthinking it :)