Did you try the bounding box scale ACE? Did you look at the objects bounding box in debug? Can you post a screenshot of that neat the edge?
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Yes, I used the bounding box scale ACE. Here is a screenshot of a model at the right border, with its bounding box scale set to 2x:
I've noticed that this behavior during runtime is very similar to what happens to 3D models in the layout editor. Here is a gif to illustrate what I mean (I'm scrolling the layout manually with the mouse):
I don't know if seeing the same symptom happening in the layout editor might give us any clue, but I thought I should include this. Perhaps this is caused by some project setting?