I was using what I recall was build 148140 with Monterey 12.0.1 and suddenly machines I booted in bridged mode were not getting a DHCP address. NAT’ed machines were but, of course, they’re NAT’ed. I upgraded to build 148314, rebooted and the DHCP is working again, but there might be a bug here that caused this.
I have never seen this behavior at any prior time.