Found something. I ran cat before/after attempting to paste into different qubes, and when I do I get the following:
~ cat /var/log/qubes/guid.<name>.log
connect: No such file or directory
Could it be that the clipboard file in dom0 is broken?
I remember someone mentioning its path in some thread, I’ll look for it as I don’t remember.
Update:
Found it: /var/run/qubes/qubes-clipboard.bin
The content is what I copied from the vm. Here’s the permissions:
~ ls -l /var/run/qubes/qubes-clipboard.bin
-rw-rw---- 1 user qubes [...]
Update 2:
I tried this solution (Qubes Clipboard™ is painful - #8 by airelemental) and got an error:
~ qvm-run -p $activevm 'xdotool type --delay 0 --file -' < /var/run/qubes/qubes-clipboard.bin
/bin/bash: line_1: xdotool: command not found
But to be fair not even the default debian-11 template has the package installed, so this shouldn’t be the long-term solution…
Update 3:
/etc/qubes-rpc/policy.EvalSimple doesn’t exist neither in dom0 nor in vms. I don’t know what it should be like (I tried @anyvm @anyvm ask and nothing changed).