You can win -as I do - multiple times a day. All you need to do is keep going back to the map screen from the BGH screen, click the gear, go to the main menu, click play, click the BGH icon, click the gear, go back to the map, click the gear to return to menu, then repeat all of that a few times to get it to reset. It’s ridiculous that this hasn’t been fixed after months but as it stands this is what you have to do.
Bubble gum hill is available every day and accessible via an icon in the upper left portion of the screen at least for me. I play on an I-phone and understand that other platforms may not be the same...I feel sorry for you if you don’t have it as it’s an integral part in completing the new levels.