Smart Animation broken, makes the screen flash black

Hello! This previous summer, I completed an app design concept for a class. Just a week ago, submitted the design for a design competition. I wanted to show someone my work, so I opened the file again, and found that one of the smart animations wasn’t rendering properly.

Instead of animating (as it did just a week ago), the entire screen goes black for the duration of the transition and then reappears with the finished frame. I can’t figure out why. I’ve even tried recreating the second frame in an identical manner, but the issue persists.

This project uses multiple smart animations done in this same way, but this is the only one that has broken. Does anyone know what is going on?