Information incorrectly leaking from host to guests?

Whenever I select text with the mouse in a host, each guest running in that hosts gets many system log / journald log messages:

and
Note the 92 times!

Key points:

1. Happens when select I text in a window in the host, even if on a different virtual desktop to the guest;
2. The messages appear immediately in all guests that are running at the time;
3. It only happens when I select text in gtk apps (eg gedit, mousepad, zim) not qt apps (eg kwrite).
4. It doesnt happen when select text in a guest - the message doesnt appear in the host or in other guests.

I have set, but it makes no difference.
<filetransfer enable='no'/>
Of course setting clipboard copypaste to no will kill the messages but also the funtionality:
<clipboard copypaste="no"/>

I'm using Xubuntu 22.04, guest kernel 6.5.0-28, host kernels 6.5.0-28 and 5.15.0-105,
qemu-system-x86 6.2, libvirt 8.0.0, libspice-vdagent 0.22.1, spice-client-gtk-3.0-5

My main concern is that anything I select in the host is being leaked from the host to all the guests,
when in fact the information selected should only be made available to the guest when the cursor moves to
and is captured by the guest, and only to that guest, not all guests.
The guests should not be watching the host.

A less important issue is that my system logs / journalctl are being filled with these messages
and it is obviously an error of some form.

Is anyone else seeing the same problem?