[knot-dns-users] How to trigger catalog zone generation

Hi all, I just set up catalog zones for the first time.  I'm using a conf file with my list of zones.  After creating a catalog zone and adding member zones to it, I executed 'knotc reload'.  The catalog zone then appeared in the output of 'zone-status', and member zones were listed with the catalog zone name.  However, 'zone-read <catalog.zone>' showed no PTR records.   I tried 'zone-reload <catalog.zone>', updated serials on the member zones and such, but the catalog zone remained empty until knotd was restarted.  I saw this behavior on both 3.4.4 and 3.5.2.  Is this the intended behavior?  Is there a way to generate the catalog without restarting knotd? Thanks in advance, Bill