Reproduce it on libvirt-7.0.0-14.1.module+el8.4.0+11095+d46acebf.x86_64
start vm and check the xml:
# virsh dumpxml rhel | grep /interface -B9
    <interface type='vhostuser'>
      <mac address='52:54:00:93:51:dd'/>
      <source type='unix' path='/var/lib/libvirt/qemu/vhost-user1' mode='server'/>
      <target dev='vhost-user1
'/>
      <model type='virtio'/>
      <driver queues='4'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
    </interface>

Update libvirt to libvirt-7.0.0-14.7.module+el8.4.0+14999+7018bc43.x86_64 and start the vm, check the xml, the bug is fixed
 virsh dumpxml rhel | grep /interface -B8
    <interface type='vhostuser'>
      <mac address='52:54:00:93:51:dd'/>
      <source type='unix' path='/var/lib/libvirt/qemu/vhost-user1' mode='server'/>
      <target dev='vhost-user1'/>
      <model type='virtio'/>
      <driver queues='4'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
    </interface>

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: virt:av and virt-devel:av security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2022:5002