Hi, after trying to upgrade one of my Rancher clusters from 2.6.6 to 2.6.7 or 2.6.8 I get this error for only one of the two clusters that are running Both clusters were created with RKE1 and are running in EC2 with RancherOS

[ERROR] error syncing '_all_': handler user-controllers-controller: failed to start user controllers for cluster c-4p8gk: ClusterUnavailable 503: cluster not found, failed to start user controllers for cluster c-qgw7q: ClusterUnavailable 503: cluster not found, requeuing