[v9_11] "resolver" test broken on Windows after !3586

After !3586 (merged), the resolver test is broken on v9_11_20 and the subscription edition's v9_11_20-S1 (see https://gitlab.isc.org/isc-private/bind9/-/jobs/950432 & https://gitlab.isc.org/isc-private/bind9/-/jobs/950429):

I:resolver:check that the resolver limits the number of NS records it follows in a referral response (17)
I:resolver:query count error: 1 NS records: expected queries 1, actual 2
I:resolver:query count error: 2 NS records: expected queries 2, actual 4
I:resolver:query count error: 3 NS records: expected queries 3, actual 6
...

With !3586 (merged) reverted, v9_11_20 Windows system tests pass (see https://gitlab.isc.org/mnowak/bind9/-/jobs/951334 & https://gitlab.isc.org/mnowak/bind9/-/jobs/951333).