Long NFS mount delays on RHEL 7.6

Our environment had a new issue introduced with servers we've upgraded from RHEL 7.5 to RHEL 7.6.

IF the server meets the condition where there are no current NFS mounts to our FAS, the following delays occur:

1. 45 second delay when mounting a share that is NFS 4.0/4.1 with sec=sys
2. 90 second delay when mounting a share that is NFS 4.0/4.1 with sec=krb5,krb5i,krb5p
3. No effect on NFS 3 mounts

Can be reproduced on 7.6 servers, but doesn't occur with 7.5 or our 6.x servers.

Anyone else able to reproduce such behavior?