When authority is ClusterAPI, create a new awsmachinetemplate with instanceType: m5.xlarge and update capi machineset to refer the new awsmachinetemplate. mapi machineset instanceType should change to m5.xlarge.

4.19.0-0.nightly-2025-05-11-153555

always

1. Create a new mapi machineset with authoritativeAPI: ClusterAPI 

2. After the machine is created, create a new awsmachinetemplate zhsunaws-lwwcm-worker11 with instanceType: m5.xlarge 
$ oc get awsmachinetemplate -n openshift-cluster-api  
NAME                               AGE
zhsunaws-lwwcm-worker1             4h28m
zhsunaws-lwwcm-worker11            9s

3. Update capi machineset to refer the new awsmachinetemplate zhsunaws-lwwcm-worker11
      infrastructureRef:
        apiVersion: infrastructure.cluster.x-k8s.io/v1beta2
        kind: AWSMachineTemplate
        name: zhsunaws-lwwcm-worker11
        namespace: openshift-cluster-api
      nodeDeletionTimeout: 10s
4. Check mapi machineset instanceType value      

Mapi machineset instanceType is still the original value m6i.xlarge

$ oc get machineset -n openshift-cluster-api zhsunaws-lwwcm-worker1 -o yaml 
      infrastructureRef:
        apiVersion: infrastructure.cluster.x-k8s.io/v1beta2
        kind: AWSMachineTemplate
        name: zhsunaws-lwwcm-worker11

$ oc get awsmachinetemplate zhsunaws-lwwcm-worker11 -o yaml | grep instanceType
      instanceType: m5.xlarge

$ $ oc get machineset.m zhsunaws-lwwcm-worker1 -o yaml  | grep instanceType
          instanceType: m6i.xlarge

$ oc get awsmachinetemplate zhsunaws-lwwcm-worker1 -o yaml | grep instanceType
      instanceType: m6i.xlarge

Mapi machineset instanceType should change to m5.xlarge