Hmm 🤔...I am seeing the same thing. This could be an unintended consequence of the Summer 2023 release and the new "Rooms" feature. An airbnb algorithm may be choosing the photo for you and not allowing you to choose it for Guest searches...definitely a problem.
I would ask Airbnb CS to escalate the problem and refer to the department that is handling issues with the new Release. You could also send a message to one of the Community Managers (Bhumika) to forward your issue to the right area of Airbnb to address it. I have always found them very helpful.
Hope you are able to get this resolved. Don't give up!