no we don't. I'll give it a try.
Thank you for your response.
-- 
S pozdravem
Bc. Martin Doubrava
CEO
_______________________________
DOUBRAVA.NET s.r.o.
    Hello.
    Do you have net.ipv6 = false in
      your settings?  This sounds very much like a recent fix that isn't
      in a release yet:
      https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1470
    --Vladimir