it looks like a coredns networking issue.
Moving to 4.6.z as a reasonable workaround exists. Workaround: Add api-int to external DNS.
The backport is proposed as part of https://bugzilla.redhat.com/show_bug.cgi?id=1907636. I'm going to dupe this bug to that one since we need to track the fix there. *** This bug has been marked as a duplicate of bug 1907636 ***