The recent changes to the inbox notifications have also broken the inbox in the chat top bar:
The inbox has jumped to be overlaying the topbar, instead of it being in its proper place. There is a second, phantom inbox visible it. There are no site favicons (although I believe that's been broken for a while), and, most annoyingly, there's no way to close it. Clicking to the side closes the phantom inbox, but esc doesn't work and I can't access the inbox button to click it again.
I use a userscript that shows me the topbar even in chat rooms, so this is especially annoying because it means that I can't check my inbox from chat anymore without breaking things. (I already couldn't view Teams content from the chat inbox, but that was a minor issue.)