Hey,
I have a very similar problem here to this and this thread.
I rebooted as the HC4 was already bugging me for a while to reboot on the motd (unattended-upgrades). Since the reboot, /dev/sdb is gone.
It's a new Samsung SSD 870 EVO as well as in the other thread. The other (still running) one is a new Crucial MX500.
I tried several Armbian kernels but no change. I went back to 5.10.57-meson64.
There are no obviously burnt components on the device.
There seem quite a few people with this problem.
Any ideas? Thanks a lot!
P.S. TP10 and TP11 are at 12V.