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Hide/Show element when scroll

The task is as follows: it is necessary to make frame-by-frame animation with the scroll.

The solution was to hide and display each frame depending on the process of the bar (оn the video, I recorded an example of what I would have done right, but for some reason it does not work).

What could be the reason?



If try to do it with transparency, then the animation runs smoothly (not as required)

Any ideas? Is this a bug or something I did wrong?