kube-apiserver (k8s 1.16) spills errors regarding calico CRDs (which have been accepted by the apiserver):
ERROR $root.definitions.org.projectcalico.crd.v1.FelixConfiguration.properties.spec.properties.kubeNodePortRanges.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.FelixConfiguration.properties.spec.properties.natPortRange has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.egress.items.<array>.properties.destination.properties.notPorts.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.egress.items.<array>.properties.destination.properties.ports.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.egress.items.<array>.properties.notProtocol has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.egress.items.<array>.properties.protocol has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.egress.items.<array>.properties.source.properties.notPorts.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.egress.items.<array>.properties.source.properties.ports.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.destination.properties.notPorts.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.destination.properties.ports.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.notProtocol has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.protocol has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.source.properties.notPorts.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.GlobalNetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.source.properties.ports.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.HostEndpoint.properties.spec.properties.ports.items.<array>.properties.protocol has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.IPAMBlock.properties.spec.properties.allocations.items.<array> has invalid property: nullable ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.egress.items.<array>.properties.destination.properties.notPorts.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.egress.items.<array>.properties.destination.properties.ports.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.egress.items.<array>.properties.notProtocol has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.egress.items.<array>.properties.protocol has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.egress.items.<array>.properties.source.properties.notPorts.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.egress.items.<array>.properties.source.properties.ports.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.destination.properties.notPorts.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.destination.properties.ports.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.notProtocol has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.protocol has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.source.properties.notPorts.items.<array> has invalid property: anyOf ERROR $root.definitions.org.projectcalico.crd.v1.NetworkPolicy.properties.spec.properties.ingress.items.<array>.properties.source.properties.ports.items.<array> has invalid property: anyOf