Gnome Tweaks for Ubuntu Desktop 22.04 LTS has a useful feature under Keyboard & Mouse called "Pointer Location". This highlights the location of the mouse cursor when you press the left Control key.
On my system, this feature causes extension windows to close whenever the left Control key is pressed: for example when I try to use left Control v to paste a password string into a Bitwarden login profile. Unsurprisingly, Chrome doesn't exhibit this behavior.
So for now I've turned the Pointer Location feature off, at least until the next time I switch back to a Chromium based browser.