Describe the bug

Message like this are able to be sent and give no error or warning.

public class CreateCharacterMessage : MessageBase
{
    public GameObject selectedPlayerPrefab;
}

The problem with this is that the field will be null when when Deserialized.

Expected behavior
There should be an error or warning when Prefabs or other objects with netId = 0 are sent in message.

Additional context
This probably applies to Commands and RPC too