Comment 1 for bug 1861293

Bit more visualistaion - https://pastebin.ubuntu.com/p/wk4M9bgXGn/

So the count is updated in ceph_hooks.prepare_disks_and_activate() which is not called directly from any action but in my case was called subsequent to a zap-disk but not after the add-disk actions hence why the count was never updated.