Currently when you enable a disabled service, just by setting `<service>.spec.enabled: true` the defaulting won't run properly since the webhook will default values to the golang default, instead of the kubebuilder set default on the CRD.

To properly enable e.g. placement, when it was disabled before make sure to also set the template to `template: {}`. 

oc patch openstackcontrolplanes/openstack-network-isolation --type='merge' --patch '{"spec": {"placement": {"enabled": true, "template": {}}}}

If other parameters of the template need to be set, they can for sure be specified.
 
This Jira is to track adding a note box or something else to the ctlplane documentation to highlight this need.