The 4.8.z bug was marked blocker- and we've been unable to reproduce within engineering so similarly marking this blocker-. We must have access to an environment to reproduce this.
This issue could be resolved by a recent fix. Please test again. See https://bugzilla.redhat.com/show_bug.cgi?id=1975907#c59
From https://bugzilla.redhat.com/show_bug.cgi?id=1975907#c59, seems issue is only fixed in 4.9. will test once backport bug #1988427 on 4.6 has been fixed.
Only one bug in the series UpgradeBlocker, and the 4.9.0 bug 1975907 already has it an impact-statement request [1]. [1]: https://bugzilla.redhat.com/show_bug.cgi?id=1975907#c61
Waiting for a backport to 4.6 of https://bugzilla.redhat.com/show_bug.cgi?id=1984449.
*** This bug has been marked as a duplicate of bug 1984449 ***