I came across the same issue with a guest distro.
I finally solved it by editing the XML File of the "Display Spice" section in
the VM settings in virt-manager.
Open the details window of the affected VM in virt-manager.
Navigate to the section "Display Spice".
Click on the Tab "XML" (XML editing has to be enabled in the virt-manager
settings).
Display Spice" section can be editted manually.
Add "<clipboard copypaste="no"/>" to the XML. It should look like this:
<graphics type="spice" autoport="yes">
<listen type="address"/>
<clipboard copypaste="no"/>
</graphics>
Source: https://unix.stackexchange.com/questions/341881/virt-manager-
copy-and-paste-is-possible-to-disable-it
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https://bugs.launchpad.net/bugs/1872527
Title:
Clipboard doesn't work 100% of the time in Ubuntu 20.04 (in KVM
guests)
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