During a match, an opponent heisted and played my Up the Beanstalk and Overlord of of the Hauntwoods. I used Doppelgang to make a copy of their Triumphant Getaway and heisted my opponent's This Town Ain't Big Enough(TTABE).

When I tried to cast a discounted on my Up the Beanstalk and Overlord of of the Hauntwoods, I could only cast TTABE for 5 mana. I made sure to hover over the cards and review the heist mechanic to verify that I was still the owner and that they were not copies or conjured cards.

I tested this on different permanents of mine or individual permanents and there was no discount. later tested to see what would happen if I would get a discounted TTABE, targeting the same Up the Beanstalk and a Triumphant Getaway that I had heisted and played from my opponent's deck. TTABE was able to be played for two mana and the the Beanstalk went back to my hand and the Triumphant Getaway went back to my opponent's hand. At this point I conceded.

Seems like an issue with discounting TTABE and heisted cards on the battlefield, but cards will return to their owners as hands as normal once cast.

Heist doesn't annoy me by itself, but this was irritating as it definitely put my opponent at an unfair advantage and is likely happening regularly in games where TTABE and heist are played on both sides of the battlefield.

I have not screenshots, but I do have a game log. Seems like the coding for TTABE needs to be fixed with respect to heist. This happened on PC.