Boot hangs at kernel launch after upgrading 13.3->13.4

From: <list_freebsd_at_bluerosetech.com>
Date: Sat, 25 Jan 2025 12:30:37 UTC
I have a UEFI amd64, root on zpool mirror system that I upgraded from 
13.3 to 13.4 using freebsd-update and boot environments.  When I 
activate the 13.4 BE, the boot process hangs after loading the kernel 
and modules, where it would normally launch the kernel.[1]

The EFI partitions have the 13.4 loader.

I'm completely stuck here and could really use some help figuring out 
what's going wrong and how to fix it.

1: https://pasteboard.co/8gC1qfLY6zmL.png