probably related to a5ec18bf184a0282dfe1b82073fbcda39132e2b0
While using DNS output adapters IXFRs are incomplete a NSEC3PARAM is added but not removed. NSD complains:
pr 21 12:58:31 prlwytzkofsky nsd[7762]: Failed to apply IXFR cleanly (deletes nonexistent RRs, adds existing RRs). Zo
Zone z1.com. contents is different from master, starting AXFR. Transfer received update to serial 2007120997 at 2016-04│ne z1.com. contents is different from master, starting AXFR. Transfer received update to serial 2007120997 at 2016-04-
-21T12:58:31 from 127.0.0.1 │21T12:58:31 from 127.0.0.1
The NSEC3PARAM should not be in the IXFR if it didn't change. Or at the very least should be removed as well.