I'am also affected by this bug, and even after closing/stopping Anydesk the transparent window is still there. Sometimes it manifests itself as black square and sometimes as the Anydesk logo.
However, I found that disabling support for "Legacy Tray Icons" in the Ubuntu Appindicators extensions it goes away. So does the Anydesk tray icon, but I can manage without the icon for now.
I'am also affected by this bug, and even after closing/stopping Anydesk the transparent window is still there. Sometimes it manifests itself as black square and sometimes as the Anydesk logo.
However, I found that disabling support for "Legacy Tray Icons" in the Ubuntu Appindicators extensions it goes away. So does the Anydesk tray icon, but I can manage without the icon for now.