[CLIENT] Friends list empty; appeared offline when logged on, online when I logged off

In queue for Solo/Duo with a friend. I got a random "attempting to reconnect" message and accidentally clicked "Exit Instead". Client closed, no big deal... but my friend was still in queue, and I still appeared as online.

I went to reopen the client and the logo popped up, but the launcher wouldn't open. Killed it in task manager and it opened. My friend cancelled the queue.

When I logged in, I then appeared as offline to my friend, and my friends list appeared to be empty. I waited about 30 seconds before I closed the client, and then I appeared as online. Repeat killing it in task manager, log in, same problem: empty friends list & appear as offline.

I left it open, and it fixed itself after about a minute or so.

It's only happened one time.