Try checking what the kernel thinks the state of the key is:
sudo apt install evtest
sudo evtest
Then does it show the F4 key as value 0 (released) when tapped?
type 1 (EV_KEY), code 62 (KEY_F4), value 0
** Package changed: gnome-shell (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: Opinion => Incomplete
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https://bugs.launchpad.net/bugs/2112439
Title:
"Repeat keys" causes `ctrl` and `alt` keys to misbehave
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