validator.c:1280: INSIST((*val->nfails) > 0) failed

Since today, all respdiff-long CI jobs have failed in scheduled daily pipelines on main.

respdiff-long CI job fails like this:

19-Apr-2024 00:04:57.765 validator.c:1280: INSIST((*val->nfails) > 0) failed

This INSIST() is new in 3b9ea189.

named.conf

named.run

Backtrace hasn't been generated for some reason. I'll try to prepare it manually.