Stroke effect resizes image upon export

I applied the “Stroke” effect to some still images to add a white border. Then I added scale keyframes to make the image move. Looks great in the timeline, but when I export, the still images (and sometimes the images beneath them) are a drastically different scale, so they get knocked outside the frame.

From reading similar bug reports, it’s possible this has something to do with GPU acceleration? Unfortunately I’m on a Mac Studio M1 Max, so it doesn’t look like I can disable GPU acceleration. 

Edit: Gaussian Blur effect is causing the same problem. Workaround is to reset all Motion effects (Position, Scale) and recreate those effects using the Transform effect instead. This fixed the problem.