Some users have been deleting the entire IrisService in the registry, it appears to also be related to the systray icons on the taskbar.
The first link is a couple years old but the second one is from a couple months ago. Apparently triggered now by the latest update kb5094126, so there may be some questionable new changes going on in this particular monkey-business department:
https://news.ycombinator.com/item?id=48818707