Riddle me this Batman!
Out of curiosity where you warming up in London before joining this ride? IIRC something similar happened to me in the past if I hit “join ride” during a warmup and the turn icon for my warmup route was on screen when I hit join ride and teleported to the new world.
I warmed up in Watopia, promptly got dropped by a pacing bot, switched to London for a meet up with a friend, then started this race in Paris. The course was the reverse and the turn off notification popped up on the first downhill from the arc.
Its a new road Zwift is working on… expect roads connecting all worlds (or not…)