Post #3225825

TIL: If you have ingress-nginx set as your default IngressClass, it automatically "stamps" a `.spec.ingressClassName: nginx` on Ingresses that don't have `kubernetes.io/ingress.class: nginx` or `.spec.ingressClassName` set. But if you create an Ingress with one of those two settings, then remove the setting later, ingress-nginx will not "stamp" it, because it only does that when the Ingress is first created. Anyway, that was a weird bug that ate an hour of my life.