Sadly doesn't surpise me. facetime camera for me (and some others) has been unusable in Linux VM's for a long time under VMware Fusion. This has been reported multiple times with no progress (same goes for audio issues). Haven't tested it with a Monterey VM and will post once I try it.
In the meanwhile the camera works fine in Linux VM's under VirtualBox. Again, haven't tried Montery VM.
