It’s very simple to fix if you’re using any screenshot apps, for example ksnip, you can install it from Flathub then just create a custom shortcut for your keyboard layout in the keyboard settings with the command like this:
/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=ksnip org.ksnip.ksnip
Then assign any key combos, even PrintScreen and configure further settings for the ksnip.
Got it, it’s painful when switching layouts between US, GB or ES, etc. by default PrintScreen didn’t work for me either with GB layout, well I just bind it to ksnip and now it works with this screenshot app. Consider it as an alternative solution.
I have just tried the tool, but when I want to take a screenshot, the main monitor goes black and I can only select the black area and cannot select the secondary monitor at all.