Undo Rollout (Manifest) Stage doesn't work with gRPC handler

[JoelCi]

There is an odd error trying to do automatic rollback of a helm deployment that uses gRPC handler for probes.

The problem is that spinnaker doesn't recognize "grpc" as a method for probes (even though it didn't happen during the deployment ).
And the error that it is showing is:
Failed to undo rollout deployment/my-app from app-namespace: error: failed restoring revision 3: Deployment.apps "my-app" is invalid: [spec.template.spec.containers[0].livenessProbe: Required value: must specify a handler type, spec.template.spec.containers[0].readinessProbe: Required value: must specify a handler type, spec.template.spec.containers[0].startupProbe: Required value: must specify a handler type]
NOTE: the rollback step is well configured, same config was tested with another app that uses "httpGet" instead of "grpc" for the probes, and the rollback step didn't fail.