My playing partner and I in a 2-player game just noticed that if we both buy the 'Inheritance' card, _and_ both move our 'Estate token' to the same action card (although we don't actually see the 'token', but I guess that's less important), then the person who bought it last effectively kicks off the previous person from using that ability.
In our case, I bought Inheritance first, and put my token on the Plaza card. I noticed while waiting for my partner to finish her play there was an estate card in my hand, and it mentions the 'Play the card with your Estate token, leaving it there' capability. However, one it's my turn, the text on my Estate cards switches to the normal image, and I do not have the Plaza capability I expected.
I'm guessing this is a bug, but please correct me if I'm wrong.