I’m pretty sure by default, virtual networks are not enabled automatically if you’re not using virt-manager GUI.
To make it run automatically, run the following: virsh net-autostart default
If it’s not that, just to make it easier to find information, what’s your host distro? I’m guessing by mention of Kickstart files that it’s something Red Hat related, possibly Rocky 9 based on your choice of guest.
Depends. SNW retconned it and said the Temporal Cold War pushed it up.