Last night my abbey disappeared in a game with Hounk. From the attached screenshot, you can see that there are no abbeys on the board, and that mine is gone from underneath my name while Hounk's remains.
I'm not sure if I can recreate how this happened. I can say that there definitely had been the possibility of playing the abbey for a few turns. So the abbey would appear, and each time I would skip this step. Then one turn, the abbey just didn't appear and then I saw that it was missing from the list of stuff under my name. Very curious and I have no idea what caused it.
Linkback: https://www.carcassonnecentral.com/community/index.php?topic=1546.0