I think this could be the exact same problem that I reported seeing with Safari ever since I got my new 14" M1 Pro MBP back in Oct 2021. It came with Monterey which I previously didn’t have on the 2020 13" MBP it replaced, so I wasn’t sure if it’s related to Safari, Monterey, or M1. And that still remains unclear to me although at least one report claims they experienced the issue also on Big Sur.