ESXi VM does not boot in UEFI mode from 20190906 snapshot ISO

[Yuri Pankov]

I have tested several snapshot ISOs available for download:

FreeBSD-13.0-CURRENT-amd64-20190822-r351363-disc1.iso - OK
FreeBSD-13.0-CURRENT-amd64-20190829-r351591-disc1.iso - OK
FreeBSD-13.0-CURRENT-amd64-20190906-r351901-disc1.iso - FAIL
FreeBSD-13.0-CURRENT-amd64-20190913-r352265-disc1.iso - FAIL

FAIL being VM shutdown after loading kernel/modules and displaying "EFI 
framebuffer information".  Relevant messages in the VM log are rather 
unhelpful:

2019-09-18T14:47:12.397Z| vcpu-0| I125: Guest: Firmware has transitioned 
to runtime.
2019-09-18T14:47:12.434Z| vcpu-0| I125: Msg_Post: Error
2019-09-18T14:47:12.434Z| vcpu-0| I125: [msg.efi.exception] The firmware 
encountered an unexpected exception. The virtual machine cannot boot.

Any hints on debugging this further?