I think you are definitely on the right track here by waiting for the ['y'] to be in the right position, but this fix is only good for the camera button, not the other buttons or actions on the image preview.
If you debug the `is_image_preview_visible` property , you see it is returning too fast. this is the problem, not the Assert.
if you wait for the "media-frame" element to be in the right position you will improve the timing of this test at a much higher and safer level.