I'm afraid this is a new one for me, not sure what could be the issue other than perhaps the package mentioned by Aravisian above. Just to throw a few more ideas:
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Try to switch between XOrg and Wayland. You can do so from the login screen, clicking on the little wheel icon as in the screenshots from this other post: How to install Wayland? - #8 by zenzen
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Have you tried ZorinOS Lite, instead? Perhaps the issue is with the desktop environment. I would load a live USB and choose the "Try ZorinOS" option to see if you can reproduce the issue then, perhaps the bug is created while downloading some updates.