I can also confirm this bug in ubuntu 20.04.5 / gnome version 3.36.8 / X11.
Turning the pointer location feature off (gnome-tweaks), the left control key
is working again.
It happens in remote sessions only, in particular with the citrix
workspace app.
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https://bugs.launchpad.net/bugs/1872230
Title:
The left Ctrl key does not work with key combos when using pointer
location in Xorg sessions
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