Restart of pdns required after adding _dmarc

cPanel v70.0.43 + Cloudlinux 2.6.32-896.16.1.lve1.4.53.el6.x86_64 + Kernelcare - using the standard Paper Lantern theme, and everything patched up-to-date. I have been struggling all day to get a new _dmark entry to resolve for a domain. The dmarc entry was recorded using the cPanel Zone Editor, and was reported as being successfully added, and could be seen as a new valid entry in the Zone Records list. Tried Synchronize DNS Records but this achieved nothing. Tried deleting and re-adding the record - nothing. Stole Infopro's whisky - didn't help :( Only after restarting the pdns DNS Server (PowerDNS) did the new dmarc entry get published. I have not tried publishing any other type of entry, so it is possible this is limited to _dmarc, but perhaps it needs checking out. I worry that users (who don't have access to restart daemons) will get frustrated if they make DNS entries in their cPanel Zone Editor, and then don't see a result.