scrollYProgress is not accurate when using with window.scrollTo

[khuongtp]

Describe the bug

scrollYProgress is not accurate when call window.scrollTo

CodeSandbox

here

Steps to reproduce

Steps to reproduce the behavior:

1. Go to CodeSandbox
2. Open the console to see the log
3. Click on the button
4. Scroll down to '....'
5. See error

Expected behavior

For example, if I call window.scrollTo(0,window.document.body.scrollHeight/2) then scrollYProgress should be 0.5