Here are the steps to reproduce on an Intel NUC 5 with a NVMe card:
Boot from yunohost-bullseye-11.0.9-amd64-stable.iso
Keep everything as default, except LVM encryption
Wait until installation finishes
After the reboot, the system does not start, instead the following message is displayed:
Volume group “system” not found
Cannot process volume group system
I will now install Debian and yunohost on top of it, since it worked for me in the past. But it looks like a bug. Maybe the Debian version that yunohost-bullseye-11.0.9-amd64-stable.iso is based on is too old?
When installing Debian, I noticed that it mentioned UEFI at various locations. It was not the case with the Yunohost ISO. I assume that the issue is related to this. Maybe the latter installs the OS using the legacy BIOS mode and this causes the trouble.