So to answer your questions:
OS Version: 6.9.2
Non Beta Plugin
I reinstalled the plugin and the hooks file has been changed now, so I figured the VM manager was disabled when I first installed it.
It is probably pretty rare that the VM manager is disabled during installation but maybe add a note somewhere that that the VM manager has to be enabled during the installation?
Unfortunately I can't test the hotplugging now because libvirt service wont start after I disabled and enabled the vm manager again. I'll have to restart the server tomorrow.
But I think my issue is fixed, thanks for the reply.