Boot install broken on NVMe for 15.0 BETA5

Hi, thought I'd ask here in case anyone has pointers before I raise a Bugzilla - can't immediately see a suitable bug.

Basically installation on an SN850X NVMe drive doesn't work. I've tried ZFS on Root, I've tried UFS, I've tried several BIOS options. They all put files on the drive, but no matter what I do I can't do get an MBR install that boots at all, or a UEFI install that adds to the boot menu. 14.3 works instantly, as does Linux Mate.

It's a C602 system (Asrock rack EP2C602, dual E5 2667v2, 64GB RAM). This doesn't natively support NVMe - it's been hacked into the BIOS using UEFITool and NVMExpress, but like I said - absolutely fine with 14.3 and Linux.

Notably, whilst 14.3 tends to prompt about removing and re-adding UEFI entries, 15.0 isn't doing so.

Currently this is on a 1TB NVMe drive, as I removed the other NVMe sticks in order to trouble shoot. Didn't work on a 4TB one either, unsurprisingly.
 
Thank you! I was losing the will to live and didn't find efibootmgr from a casual search at the time, it did exactly what I wanted. The installer is still broken of course, but the install is working now

Did

load /boot/kernel/kernel
load /boot/kernel/zfs.ko
set currdev="zfs:zroot/ROOT/default:"
boot

to boot from install media, then.

efibootmgr -a -c -l /boot/efi/EFI/freebsd/loader.efi -L FreeBSD-15

I'll get a bug logged as well
 
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