4.16 installer fails Cluster API network validation, when NSX port group are in use, with the following error:

FATAL failed to fetch Cluster API Machine Manifests: failed to generate asset "Cluster API Machine Manifests": unable to retrieve network names: network '/<datacenter>/host/<compute_cluster>' not found

The above is seen in a 4.16.27 deployment, with an empty `.platform.vsphere.failureDomains[].topology.networks` key value.
- NOTE: a similar error is seen when `.platform.vsphere.failureDomains[].topology.networks` points to a NSX port group *name*:
i.e. 

$ openshift-install create manifests
WARNING imageContentSources is deprecated, please use ImageDigestSources
INFO Consuming Install Config from target directory
I0114 13:11:32.100352  558355 session.go:236] "Created and cached vSphere client session" server="pn014vvcsw12f.iaas.bd.rijksweb.nl" datacenter="" username="chpuser@vsphere.local"
FATAL failed to fetch Cluster API Machine Manifests: failed to generate asset "Cluster API Machine Manifests": unable to retrieve network names: network '/IAAS/host/cl028s/<insert networkname>' not found

4.16.27    

Always

Port group validation fails during the manifests creation of the installer.

Port group validation to succeed.

While the same configuration is seen to work in a 4.14 environment, while using the 4.16.27 installer and the cluster deployment relies on NSX PortGroups, we're seemingly hitting the following issue [0]:


// With NSX, Portgroups can have the same name, even within the same Switch. In this case, using an inventory path
// results in a MultipleFoundError. A MOID, switch UUID or segment ID can be used instead, as both are unique.
// See also: https://kb.vmware.com/s/article/79872#Duplicate_names
// Examples:
// - Name:                "dvpg-1"
// - Inventory Path:      "vds-1/dvpg-1"
// - Cluster Path:        "/dc-1/host/cluster-1/dvpg-1"
// - ManagedObject ID:    "DistributedVirtualPortgroup:dvportgroup-53"
// - Logical Switch UUID: "da2a59b8-2450-4cb2-b5cc-79c4c1d2144c"
// - Segment ID:          "/infra/segments/vnet_ce50e69b-1784-4a14-9206-ffd7f1f146f7"

[0] https://github.com/vmware/govmomi/blob/6ac4eabbbd6deb6bbad6b2846944c5343c31ca56/find/finder.go#L812-L836