The steps to reproduces are mentioned in [1]. One basically needs a
unbound machine and 2 DNS servers that are master for a given zone. The
idea is to then simulate an outage of one of the masters and see if
unbound will still try to reach that dead master even after having
received an answer from the surviving master. This attempt to query both
causes delays because the dead one will of course never reply leading to
a timeout. This bad behavior only manifested when domain-insecure was
used.

Christian, I'd really like to help here but I don't have the time (yet).

1: https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=2882#c0

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https://bugs.launchpad.net/bugs/1732150

Title:
  Unbound behaviour changes (wrong) when domain-insecure is set for a
  stub zone with multiple stub-addr(s)

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