Little ghost window beside the main application window appears in MacOS27 Golden Gate - any ideas?

Hello community,

since the Update to MacOS 27 (Golden Gate) a little black “ghost window” appears on the lower left side of the main window of my zoom window. It does nothing - it’s just there.

It seems that it only appears, when someone joins the meeting. I cannot bring it up only by launching an new meeting by myself. The screeshot I did after my colleague left.

I wonder if someone else has the same experience.

Regards,

Stefan

Hardware: MacBook Pro M1 Max