Issue was not reproducible on 4.10 cluster at 250 nodes with following OVN RPMS ovn21.09-central-21.09.0-19.el8fdp.x86_64 ovn21.09-vtep-21.09.0-19.el8fdp.x86_64 ovn21.09-21.09.0-19.el8fdp.x86_64 ovn21.09-host-21.09.0-19.el8fdp.x86_64 If there is consensus that OVN version here should be comparable to the version that carries this fix in 4.10 then we can call this verified.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (OpenShift Container Platform 4.9.6 bug fix update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:4119