Anyone else find themselves in a Party Chat of one, i.e. You, one which you didn't start?

Yep, all the time. I usually realize it when I happen to see a notification that a friend has joined my party. If that happens during a game, it is rather annoying. I have to leave my friend waiting there because there’s no way to turn on party chat while racing without pausing the game. Not an option while playing multiplayer.

OP was deleted, leaving only my reply? Weird. Might as well delete the whole thread.

Might as well since there is a general Xbox gaming forum for these types of discussions.

But, no - I have not experienced this.