Just to clarify: this isn't an upgrade issue. This happens whenever the ovnkube-master process is restarted while a service is idle. I'll have to investigate if this ever worked in prior version, but my gut feeling tells me that this was always broken.
Documentation team, I created knowledge base solution https://access.redhat.com/solutions/6671241. Please decide if it should be enough to document this in a KCS, or if you want to integrate this as part of our 4.6 and 4.7 documentation. Either way, the Knowledge Base Solution should contain all the details that you need in order to document this issue.
Thanks,
Andreas