Element's depicted opacity depends on scroll speed

For my [examples for scrolling shadows](https://kizu.dev/scroll-driven-animations/#stuck-states-for-the-sticky-headers), when inspecting the shadow animation, it seems that the value for the opacity of the element representation is updated on something like scroll end, and when it goes to 0/out of bounds, it is not updated?

https://github.com/bramus/scroll-driven-animations-debugger-extension/assets/177485/f310c1a1-069d-4297-948e-43562cf1d68d