verified on nightly build: 4.5.0-0.nightly-2020-06-09-223121 on dev vsphere server where the network type is OpaqueNetwork.
When "launching openshift-install create cluster --dir ./install", network list can be shown there.
[jima@dns-dhcp-jumphost 2020-06-09-223121]$ ./openshift-install create cluster --dir ./install
? SSH Public Key /home/jima/.ssh/openshift-qe.pub
? Platform vsphere
? vCenter vcenter.sddc-44-233-241-153.vmwarevmc.com
? Username email@example.com
? Password [? for help] **************
INFO Connecting to vCenter vcenter.sddc-44-233-241-153.vmwarevmc.com
INFO Defaulting to only available datacenter: SDDC-Datacenter
INFO Defaulting to only available cluster: Cluster-1
INFO Defaulting to only available datastore: WorkloadDatastore
? Network [Use arrows to move, enter to select, type to filter, ? for more help]
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, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.