useScroll with "start"/"end" string offsets broken with position: sticky inside transformed parent since 12.37.0 #3658

Describe the bug

Since 12.37.0 ("Support for hardware accelerating "start" and "end" offsets in scroll and useScroll"), useScroll with string offsets like ['start start', 'end end'] no longer works correctly when the target element contains a position: sticky child and is nested inside a parent motion.div with a scale transform.

The scroll progress starts at a non-zero value (content is already partially revealed on entry) and doesn't reach 1.0 before the section scrolls out of view (the reveal animation never completes).

CodeSandbox reproduction

https://codesandbox.io/p/sandbox/5nflw4

Steps to reproduce

1. Wrap a useScroll + position: sticky scroll-reveal component inside a motion.div that applies a scale transform
2. Use offset: ['start start', 'end end'] on the inner useScroll
3. Scroll to the section
4. Observe: content is already partially revealed on entry, and the animation doesn't complete before scrolling past

Expected behavior

scrollYProgress should range from 0 to 1 across the full scroll distance of the target element, regardless of CSS transforms on ancestor elements. This worked correctly in 12.36.0 and earlier.

Environment details

• Works: motion@12.36.0 / framer-motion@12.36.0
• Breaks: motion@12.37.0 / framer-motion@12.37.0 and later (tested up to 12.38.0)
• Breaking change: "Support for hardware accelerating "start" and "end" offsets in scroll and useScroll" (12.37.0 changelog)
• OS: Linux
• Browser: Chrome (latest)
• React: 19.1.0
• Next.js: 16.2.0