Sending a message to yourself is kind of an easter egg/bug. We didn't intend on allowing that to happen, so the behavior is undefined and not really supported.
Is there a specific use-case for you to send messages to yourself? I assume you mean you are sending and receiving the messages with the same username...
Maybe I should register a service rather than use my username? All I'm doing is sending notifications from my server to me via curl.
Also, the problem cleared up. When I tapped my username before, I got nothing in the conversation window. Now the history is showing up.
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