OpenStackControlPlane CR creation fails with "some validation rules were not checked because the object was invalid"

Issue

OpenStackControlPlane CR creation fails with some validation errors and required values:

$ oc apply -f openstack_control_plane.yaml
The OpenStackControlPlane "openstack-control-plane" is invalid: 
* spec.galera.templates.openstack.storageClass: Required value
* spec.galera.templates.openstack-cell1.storageClass: Required value
* spec.glance.template.glanceAPIs.default.containerImage: Required value
* spec.glance.template.imageCache: Required value
* spec.barbican.template.serviceAccount: Required value
* spec.nova.template.apiContainerImageURL: Required value
* spec.nova.template.computeContainerImageURL: Required value
* spec.nova.template.conductorContainerImageURL: Required value
* spec.nova.template.metadataContainerImageURL: Required value
* spec.nova.template.novncproxyContainerImageURL: Required value
* spec.nova.template.schedulerContainerImageURL: Required value
* <nil>: Invalid value: "null": some validation rules were not checked because the object was invalid; correct the existing errors to complete validation