KVM clipboard sharing with client running Wayland

I have Fedora 35 installed as a VM, with Qemu/KVM as the hypervisor and virt-manager as the graphical front-end, running under Manjaro KDE. Following numerous guides & answers I have managed to get clipboard sharing to work between the host and client using the spice display server and spice-vdagent on the client. However this only seems to work when the client logins to the X11 session. I have found [a Reddit post](https://www.reddit.com/r/swaywm/comments/pg0rqi/clipboard_sharing_using_spicevdagent_not_working/) which claims spice-vdagent only supports the X11 clipboard, which is uncorroborated but so far agrees with my testing. Here's the systemd journals when I login to X11/Wayland on the VM respectively:

> journalctl -b -u spice-vdagentd*
## timestamps & hostname removed

## X11
spice-vdagentd: opening vdagent virtio channel
spice-vdagentd: Set max clipboard: 104857600
spice-vdagentd: Set max clipboard: 104857600

## Wayland
spice-vdagentd: Error getting owner UID for pid 1063: No such process
spice-vdagentd: UID mismatch: UID=1000 PID=1063 suid=4294967295

So my question is: is it true that spice-vdagent does not yet support Wayland clipboard? If false, what could be going wrong? If true, are there currently any good workarounds (except for the obvious "don't use Wayland")?