For some reasons that might be related to the 2nd issue, even though it says resolved, I am still seeing network errors in GKE nodes, located in Singapore (asia-southeast1)
Warning FailedToCreateRoute 4m59s route_controller Could not create route fc61a148-b428-43fa-xxxx-xxxx 10.28.167.0/24 for node gke-xxx-xxx after 16.320065487s: googleapi: Error 503: INTERNAL_ERROR - Internal error. Please try again or contact Google Support.