I’ve ran three of the five TWW weekly dungeons and I have my flight set to stable flight and when i come out, it’s on dragon flying and i have to reset it back to stable flight and i’ve had to do this three times now.
I can confirm that in that case, with every toon I’ve run even just once through a TW dungeon so far. I was assuming it was a consequence of levelling up, but I guess it’s this instead.