Description of problem: Raised upstream. Having a range is not equivalent to having a cidr + avoidbuggyip, because it will not be compatible with the aggregation length validation. A range like 10.0.1.0/24 becomes something like 10.0.1.1-10.0.1.254, which won't pass the aggregation lenght=24 because the corresponding cidr is narrower. For this reason, the avoidbuggyips flag must be restored.
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 (Moderate: OpenShift Container Platform 4.12.0 bug fix and security 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/RHSA-2022:7399