As best as I can remember, nothing appeared on the screen. I moved to the bottom of the screen and a pop up menu appeared with either "chicken chase" or nothing in it.. Maybe a 0/0? No sprites of any sort except for background appeared before hang. I was still only 2/3 of the way down.
Thank you for the further details. Did you see this happen more than once or have you been able to play the Chicken Chase mini-game on other occasions? I would guess that you've been able to see that mini-game since you knew which one it was to call out the bug, but wanted to check and not just operate on assumption.