RL failure for Atari games (alignment) [Research]

I'm trying to find a paper (\~2019) that I heard in a talk regarding alignment in the context DQN/DDPG that was applied to an Atari-type game (Pong/Breakout). Apparently, the realization was that if an extra row of pixels was added to the frame, the algorithm fails. This might be a shot in the dark, but does anyone know which paper this would be?

alignment failure games machinelearning research rl