Since insets and sizes are animatable, it seems that one can pretty easily write something that modifies its own view progress. If it's defined in a way that decreases the coverage as the animation progresses, one can get the animation into a state where it's rapidly oscillating.
Some test cases (Strobing warning - Small, but pretty annoying to look at.):
With both cases, I could get all 3 browsers into a strobing state by scrolling slowly around the point where the view-timeline animated element disappears off the top of the scroller.
Since insets and sizes are animatable, it seems that one can pretty easily write something that modifies its own view progress. If it's defined in a way that decreases the coverage as the animation progresses, one can get the animation into a state where it's rapidly oscillating.
Some test cases (Strobing warning - Small, but pretty annoying to look at.):
With both cases, I could get all 3 browsers into a strobing state by scrolling slowly around the point where the view-timeline animated element disappears off the top of the scroller.