In older Debian releases, I think at least until Debian 9, it was possible to access PVs and LVs which are stored in a LV. The PV inside the containing LV could be displayed and activated with vgdisplay(8) and vgchange(8).
This scenario makes sense if you have a LV for a VM guest, that uses LVM inside, and when you need to access file systems in the guest from the host (while the guest is shutdown). I don't see how this can be done in the current Debian 12. Steve
