The issue will be fixed permanently with the next OpenShift update.
We implemented a workaround allowing ingress traffic via alternative label and applications are again reachable.
Workaround proposal sent to VSHN, waiting for confirmation.
The issue is identified as a bug in the Cluster Network Operator:
https://issues.redhat.com/browse/OCPBUGS-28920
We are currently testing a possible workaround and will update this incident shortly.
VSHN and Red Hat are currently investigating the issue.