Scatterbrained me actually forgot, that I ran into this recently in the context of fedora-39 as well (here) and solved it by getting help in configuring seLinux to allow QubesOS file transfers into /tmp, where configure mz entire setup to place QubesIncoming etc. with the aim to avoid build up of stale material.
Provisioning of the corresponding seLinux rules is now integrated in my salt setup and is expected 
to puzzle me no more as fedora continues its march to higher release numbers.
Sorry for the noise.