During the test of the new storage model, we added a new storage id over a LVM volume group.
Now this volume group where the storage id has been created is holding a mounted logical volume: this makes impossible to delete the storage id, even if it is disabled.
To reproduce, (even without a new VG), simply create a LVM storage id over the existing volume group PVE creates during installation: since /dev/pve holds many mounted logical volumes, now it is impossible to delete the created storage id.
Now this volume group where the storage id has been created is holding a mounted logical volume: this makes impossible to delete the storage id, even if it is disabled.
To reproduce, (even without a new VG), simply create a LVM storage id over the existing volume group PVE creates during installation: since /dev/pve holds many mounted logical volumes, now it is impossible to delete the created storage id.