I updated a firewall from 25.7.10 yesterday only to find the firewall would no longer boot.
Rebuilding from scratch to 25.7.11_1 and then re-installing plugins led to the same result.
Rebuilding and iterating through the plugins led to os-cpu-microcode-amd being the cause.
The hardware is a Minisforum Ryzen 9 9955HX MS-A2.