grpc-swift: Stream stops receiving messages after changing connection from Wifi to Cellular

Question Checklist

• Updated grpc-swift to the latest version
• I read the Contribution Guidelines
• I read README
• I searched for existing GitHub issues (especially, there are many resolved issues related to SSL)

Question Subject

How to restart a stream after changing connection from Wifi to Cellular?

Question Description

I use SwiftGRPC in iOS app and I have the client like:

service UpdateService {
    rpc GetUpdates (UpdatesConnection) returns (stream Update);
}

I subscribe on connectivity state of channel:

updateClient.channel.subscribe { connectivityState in
...
}

Then I make request to create stream from server:

let call = try updateClient.getUpdates(UpdatesConnection()) { result in
	switch result.statusCode {
		…
	} 
}

When I change iPhone connection from Wifi to Cellular, the stream stops receiving messages from server but the connectivityState (subscription to connectivity state) and result.statusCode keeping silent. After few minutes connectivityState gets .idle and result.statusCode gets . unavailable. When result.statusCode gets . unavailable I trying to call let call = try updateClient.getUpdates(UpdatesConnection()) again, but stream doesn’t receive messages anyway. So I’ve added subscription on iOS network state (Reachability) and I destroy the updateClient and recreate it when connection get changed from WIfi to Cellular. Only after destroying and recreating the updateClient the stream works properly - it receive messages. Am I doing right? Maybe my way is wrong and there is another way to restart stream after changing connection?