controller-runtime: Builder.Watches + EnqueueRequestsFromMapFunc = invalid kind

I’m working on migrating our operator to Operator SDK v0.19.4, and along with that comes a controller-runtime bump to v0.6.1. We use a custom event handler, which I’ve used EnqueueRequestsFromMapFunc to register via Watches. Here’s the basic structure:

func (r *TestReconciler) SetupWithManager(mgr ctrl.Manager) error {
    return ctrl.NewControllerManagedBy(mgr).
        Watches(
            &source.Kind{Type: &corev1.Pod{}},
            &handler.EnqueueRequestsFromMapFunc{
                ToRequests: handler.ToRequestsFunc(func(a handler.MapObject) []reconcile.Request {
                    return []reconcile.Request{
                        {
                            NamespacedName: types.NamespacedName{
                                Name:      a.Meta.GetName(),
                                Namespace: a.Meta.GetNamespace(),
                            },
                        },
                    }
                }),
            }).
        Complete(r)
}

However, somewhere along the way of the controller being created and this registered, I get back a very generic error:

expected pointer, but got invalid kind

If I switch out this custom Watches for the standard For and Owns combination, the controller is created and registered successfully. So, I seem to have narrowed the error down to the usage of EnqueueRequestsFromMapFunc.

Looking at this example from the documentation, I’m using the correct syntax/structure as far as I can tell.

I’m not sure where to go from here, so hoping someone here will be able to help out. Thanks!