unable to boot latest 14-stable

Source upgrade from 14.0-STABLE #0 stable/14-n265273-803f088147d3: Sat Sep 30 12:48:08 BST 2023 
to 14.0-STABLE on rpi4/8GB as of a few hrs ago

results in the following on reboot:

Consoles: EFI console  
GELI Passphrase for disk0p3: 

Calculating GELI Decryption Key for disk0p3: 422818 iterations...
ZFS: unsupported feature: com.delphix:head_errlog
ZFS: pool zroot is not supported
     Reading loader env vars from /efi/freebsd/loader.env
     Setting currdev to disk0p1:
     FreeBSD/arm64 EFI loader, Revision 1.1

     Command line arguments: loader.efi
     Image base: 0x39af6000
     EFI version: 2.80
     EFI Firmware: Das U-Boot (rev 8225.1792)
     Console: efi (0x1000)
     Load Path: /efi\boot\bootaa64.efi
     Load Device: /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/UsbClass(0x0,0x0,0x9,0x0,0x3)/UsbClass(0x125f,0xa15a,0x0,0x0,0x0)/HD(1,GPT,1112f34d-6695-11ed-9a74-dca632e248fc,0x28,0x82000)
     Trying ESP: /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/UsbClass(0x0,0x0,0x9,0x0,0x3)/UsbClass(0x125f,0xa15a,0x0,0x0,0x0)/HD(1,GPT,1112f34d-6695-11ed-9a74-dca632e248fc,0x28,0x82000)
     Setting currdev to disk0p1:
     Trying: /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/UsbClass(0x0,0x0,0x9,0x0,0x3)/UsbClass(0x125f,0xa15a,0x0,0x0,0x0)/HD(2,GPT,1112f34d-6695-11ed-9a74-dca632e248fc,0x82800,0x1800000)
      Setting currdev to disk0p2:
      Trying: /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/UsbClass(0x0,0x0,0x9,0x0,0x3)/UsbClass(0x125f,0xa15a,0x0,0x0,0x0)/HD(3,GPT,1112f34d-6695-11ed-9a74-dca632e248fc,0x1882800,0x72e84000)
      Setting currdev to 
      ERROR: cannot open /boot/lua/loader.lua: no such file or directory.


Type '?' for a list of commands, 'help' for more detailed help.
OK 

How to fix? Boot from standard media and upgrade the zpool?
Is it a zpool issue? Some other problem?

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