My experience was the same as the OP, if it happens again I will try to record it.
To answer your questions for the time it happened to me:
On Xbox One, racing at Germany I believe, online Ranked. Nothing notable happened from the previous session that I remember.
There was 16 people plus me, qualification was fine, the countdown finishes and the list of people on the right goes as if we are going to get the HUD up and prep for manual start but then the list comes back up on the right side waiting for one person to connect, and Awaiting Players on the left with the spinning circ