The logs show:
client xx.xx.xx.xx#53401: view external: updating zone 'example.net/IN': update unsuccessful: host.example.net/A: 'rrset does not exist' prerequisite not satisfied (YXRRSET) client >xx.xx.xx.xx#46869: view external: updating zone 'example.net/IN': update unsuccessful: host.example.net/TXT: 'RRset exists (value dependent)' prerequisite not satisfied (NXRRSET)
That also only appeared once since it was setup...
jlc