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When loading a saved multiplayer game, the teams change when re-inviting a friend into the lobby. I was previously on the same team as my friend, but once my friend connects into the lobby after I re-invite her, the game places us on separate teams instead of on the same team (and for some reason, the UI randomly shows some or all players including AI as being on Team 0).
Our multiplayer game was created just yesterday, after GU 15, and this is the first time we have tried to load the saved game. We have tried different autosaves, we have tried her inviting me (using her local saves) instead of me inviting her, but no matter what the same issue is occurring.
Here's a video showing the issue. I'm able to declare war on my friend, which confirms that we are no longer on the same team as usually the game will not let you declare war on someone who is on the same team as you (obviously):
I have submitted a Ubisoft Support Case about this and have attached the save file to that.