Scene Layers No Longer Show Animation Effect

The layer strip above the scene now only shows a singly tiny square of the image instead of the full duration of its appearance, and where the fade animation effect takes place. This makes it impossible to control my animation, as there's no indication which later has the animation effect and where it occurs within the scene. 

I updated my iOS version in the hopes it would resolve the problem, but it only got worse: on my iPad the layer strip doesn’t appear at all! This makes the app completely unusable on my iOS. On my Mac.

Could you please restore the appearance of layers to the full duration of scene? |

iPad:
 

Mac: