That helped: it shows the version as 1.10.1
This does not match Flatpak version and your flatpak list does not show it.
It does not match APT and also APT shows it as not installed.
It does match the Snap version.
I cross referenced and in your post here:
You have a snap package installed: kf5-5-110-qt-5-15-11-core22
This is a KDE Framework package which includes various KDE tools... including ksnip
Removing kf5-5-110-qt-5-15-11-core22 in Snap should remove all of the KDE framework desktop tools.
And I agree - Snap is... a marvel of shaking your head.
You can snap remove command each snap package, then run
sudo apt remove --purge gnome-software-plugin-snap snapd
to get rid of it entirely.