After upgrading from OpenShift 4.13 to 4.14 with Kuryr network type, the network operator shows as Degraded and the cluster version reports that it's unable to apply the 4.14 update. The issue seems to be related to mtu settings, as indicated by the message: "Not applying unsafe configuration change: invalid configuration: [cannot change mtu for the Pods Network]."

Upgrading from 4.13 to 4.14
4.14.0-0.nightly-2023-09-15-233408
Kuryr network type
RHOS-17.1-RHEL-9-20230907.n.1

Consistently reproducible on attempting to upgrade from 4.13 to 4.14.

1.Install OpenShift version 4.13 on OpenStack. 
2.Initiate an upgrade to OpenShift version 4.14.  

The network operator shows as Degraded with the message:

network                                    4.13.13                              True        False         True       13h     Not applying unsafe configuration change: invalid configuration: [cannot change mtu for the Pods Network]. Use 'oc edit network.operator.openshift.io cluster' to undo the change.
 
Additionally, "oc get clusterversions" shows:

Unable to apply 4.14.0-0.nightly-2023-09-15-233408: wait has exceeded 40 minutes for these operators: network

The upgrade should complete successfully without any operator being degraded.

Some components remain at version 4.13.13 despite the upgrade attempt. Specifically, the dns, machine-config, and network operators are still at version 4.13.13. :

$ oc get co
NAME                                       VERSION                              AVAILABLE   PROGRESSING   DEGRADED   SINCE   MESSAGE                                                                                                         
authentication                             4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
baremetal                                  4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
cloud-controller-manager                   4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
cloud-credential                           4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
cluster-autoscaler                         4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
config-operator                            4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
console                                    4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
control-plane-machine-set                  4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
csi-snapshot-controller                    4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
dns                                        4.13.13                              True        False         False      13h                                                                                                                     
etcd                                       4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
image-registry                             4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
ingress                                    4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
insights                                   4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
kube-apiserver                             4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
kube-controller-manager                    4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
kube-scheduler                             4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
kube-storage-version-migrator              4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
machine-api                                4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
machine-approver                           4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
machine-config                             4.13.13                              True        False         False      13h                                                                                                                     
marketplace                                4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
monitoring                                 4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
network                                    4.13.13                              True        False         True       13h     Not applying unsafe configuration change: invalid configuration: [cannot change mtu for the Pods Network]. Use 'oc edit network.operator.openshift.io cluster' to undo the change.
node-tuning                                4.14.0-0.nightly-2023-09-15-233408   True        False         False      12h                                                                                                                     
openshift-apiserver                        4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
openshift-controller-manager               4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
openshift-samples                          4.14.0-0.nightly-2023-09-15-233408   True        False         False      12h                                                                                                                     
operator-lifecycle-manager                 4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
operator-lifecycle-manager-catalog         4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
operator-lifecycle-manager-packageserver   4.14.0-0.nightly-2023-09-15-233408   True        False         False      12h                                                                                                                     
service-ca                                 4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h                                                                                                                     
storage                                    4.14.0-0.nightly-2023-09-15-233408   True        False         False      13h