Scale jump issue in premiere pro 24

Hi all

I'm working on a customer project that I originally edited in version 23.6.

Upon opening in version 24, a single scale animated image jumps in size at exactly when the animation hits a value of 50 and shows a weird behaviour thereafter. I have multiple other images that are scale animated, but the values of those are all above 100 and they do not jump in size during the animation.

When rendered out, the animation is perfect, the problem shows in the timeline only.

I checked and tried all solutions in earlier threads on the topic I could find. But none of the proposed solutions, like clearing all caches, switching between GPU/software acceleration, reset preferences and copy content into new project etc., helped. 

This seems to be an old problem that is showing up again in version 24.

Any new ideas?

Thanks

Juerg