There was breaking change around 1.18, which was spread over few releases to make migration easier. Similar fix pattern as with graduating beta to stable APIs for things like Ingress, they just IIRC covered all the core APIs or so? Don't have time to look it up right now.

Generally the only issue was forgetting to update whatever you use to setup the resources, because apiserver auto-updated the formats to the point worst case you could just grab them with kubectl get ... -o yaml/json and trim the read-only fields.