BIND validates "A nimportequoi.otsuka" and yields an answer with AD bit
set.

Unbound gives back the answer but without the AD bit.

[Try it yourself, 'dig @unbound.odvr.dns-oarc.net A
nimportequoi.otsuka' and 'dig @bind.odvr.dns-oarc.net A nimportequoi.otsuka']

In some cases (difficult to pinpoint, depending on the resolver's
state), both BIND and Unbound return SERVFAIL.

Who's right?

PS: dnsviz claims that names like eb2dz5xm4s.otsuka are "secure,
non-existent" while they elicit an answer.
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