Created attachment 865005 [details]
Screenshot

It happens when I change a window with ALT+TAB (typically from Chrome or
Thunderbird) to a gnome-terminal and I still see the previous app in the
top-left corner (please see my attachment) and I can't get the cursor when I
click in the terminal window.

$ gnome-terminal --version
# GNOME Terminal 3.46.8 using VTE 0.70.3 +BIDI +GNUTLS +ICU +SYSTEMD

$ gnome-shell --version
GNOME Shell 43.3

I bet it's the recent change where both gnome-shell and gnome-terminal were
updated.