We see that the MachinePool feaure gate has become default=true in a recent version of CAPZ. See https://github.com/openshift/installer/pull/8627#issuecomment-2178061050 for more context.

We should probably disable this feature gate. Here's an example of disabling a feature gate using a flag for the aws controller:

https://github.com/openshift/installer/blob/master/pkg/clusterapi/system.go#L153