The job definition is trying to set CLUSTER_NETWORK_TYPE in a place that doesn't actually work and is simply ignored, so it ends up bringing up an openshift-sdn cluster instead (Noticed by Tim)
Looks good on recent e2e-gcp-ovn-upgrade. Verifying based on observations.
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 (OpenShift Container Platform 4.6 GA Images), 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/RHBA-2020:4196