ovnkube-node crashed during SDN to OVN Migration in RHOCP 4

Issue

• OVN component ovnkube-node is in CLBO(CrashLoopBackOff) state with messages as below in the logs.

+ sysctl -w net.ipv6.conf.all.forwarding=0
 sysctl: cannot stat /proc/sys/net/ipv6/conf/all/forwarding: No such file or directory
...
...
2025-04-18T00:55:08.666757898+00:00 stderr F F0418 00:55:08.666735   68578 ovnkube.go:137] failed to run ovnkube: failed to start node network controller: failed to start default node network controller: upgrade hack: failed while waiting for the remote ovnkube-controller to be ready: context deadline exceeded, upgrade hack: unable to find LRSR for node <specific-peer-node-name>

• Cluster is in halt state