System reboot to BIOS boot menu

Ever since update of Linux kernel to 6.2.0-26, this laptop (Lenovo Thinkpad T520) on reboot, goes to a boot loop directly to the BIOS Boot menu. On <Cntrl><Alt><Delete> from there, still stuck in that loop.

It displays an error message just before the BIOS Boot menu, but flashes by too fast to actually make out what is there.

If it shutdown, and cold boot, it boots normally to the Grub2 Boot menu.

There is a problem somewhere.

This machine is ZFS-On-Root. Another User says he is having this same problem, but on an LVM2 install. The common denominator seems to be the update to Linux kernel 6.2.0-26.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-6.2.0-26-generic 6.2.0-26.26~22.04.1
ProcVersionSignature: Ubuntu 6.2.0-26.26~22.04.1-generic 6.2.13
Uname: Linux 6.2.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: GNOME
Date: Sun Aug 20 14:14:56 2023
InstallationDate: Installed on 2021-09-23 (696 days ago)
InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
SourcePackage: linux-signed-hwe-6.2
UpgradeStatus: Upgraded to jammy on 2022-08-17 (368 days ago)