Game #5823400
I got the wild idea of buying a Villa while I had a Develop still in my hand. It went well the first time but the second time I tried to Develop the newly bought Villa into the last Baker and I got into a state where I was back in my Buy phase without any buys and some coin tokens I didn't want to use. The "End Turn" button was missing so I couldn't find a way to end my turn. I tried undoing and reconnecting but eventually had to develop something else and missed out on the last Baker.
I think the "work around" is to "spend" 0 coin tokens.
Yes, that works. Even with 0 buys, you have the right to spend your coin tokens so the interface waits for your decision.
But there's no reason to not have the "End Turn" button show up as well. I tried the same thing with treasures still in hand: then you get the additional choice of autoplay treasures / no treasures but still no end turn button.