Casual Game Fails To Start When In Party Chat With The Proposed Opponent

I checked the last update and I didnt see a fix for this consistent, repeatable bug.

Can someone please reproduce this bug and post F1 information for me?

HERES HOW IT WORKS
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1. Start a party chat with your friend.

2. Invite the same friend to a casual game

3. Game log instantly reports that your friend has joined the casual game and left.
(your friend has not received the invitation I believe)

4. Disband party chat and attempt casual game again.... It will work normally.

Thanks for your help guys, and sorry if this is an old bug.

 

I bet it's because it's trying to set up co-op, but your teammate is also your opponent.