Large image corruption

I’m using some relatively large JPGs for a slideshow (7000x4000) that relies on a lot of Ken Burns zooming, and I’m noticing that while editing and exporting to ProRes I’m getting occasional image corruption–an image will “break up” into horizontal lines. This seems to be happening somewhat randomly, but more frequently on slides involving masks and layers.

(Happy to provide a “problem” slideshow for support to download if it helps.