Why
https://github.com/CZ-NIC/knot-resolver/blob/c8cb9740f8ebd34219c7d860106969fcbb6c7bf6/modules/view/view.lua#L73
tests addr and dst_addr as "if ... elseif"?

Right, thanks!  That really is a non-sense, as I believe this elseif could never succeed.  Fixup:
https://gitlab.nic.cz/knot/knot-resolver/-/commit/982162956aaa1d2e85bc3e35dca663b3566943a8

Below this command I have more view:addr policies to filter on src address. Can it conflicts?

So after that fix it can still conflict.  As the semantics was intended, all source-based view:addr rules are tried first.  So if they trigger a non-chain action for a particular request from client, no other view rule will be tried.

--Vladimir