Chat Service has no messages only at start

At the start, just right after the default BeamContext is ready, I subscribe to the chat service, then I use ChatView to load chats and messages.

The chats found in the chat view are correct, but they don't hold any messages, even if I have sent chat messages in those chats before. In fact, the next time that some update happens in the subscription, previous messages are present.

Is there something I'm missing? Should I wait for some kind of initialization before subscribing?