We are going to introduce datacenter and cluster level 4.5, which will be available only on CentOS/RHEL 8.3 hypervisors with Advanced Virtualization 8.3 packages.
Verified on ovirt-engine-188.8.131.52-0.19.el8ev.noarch
This bugzilla is included in oVirt 4.4.3 release, published on November 10th 2020.
Since the problem described in this bug report should be resolved in oVirt 4.4.3 release, it has been closed with a resolution of CURRENT RELEASE.
If the solution does not work for you, please open a new bug report.
Yes, we should be careful when removing CPUs (hopefully that won't happen again). The same issue can occur also when the CPU definition changes, as it happened with noTXS recently. We introduced simple "translator" in the UI to handle it.