Scroll correction sometimes gets stuck on estimating row sizes

[mio-moto]

Describe the bug

I think this bug is in the same ballpark to #1221:

We have a complex layout that is (for testing purposes) explicitly undersized and causes layout shifts. This sometimes ends up in an infinite loop trying to correct the scroll position and then stays stuck. Internally we've observed this on some of our playwright tests and eventually found a reproduction.

Oddly enough this behavior can be "fixed" by halting the js execution for a frame and then continue, which makes me suspect that the measurement cache or layout measurement is derived from an outdated layout box.

If necessary, I can try to create a specific sandboxed reproduction.

Your minimal, reproducible example

no reproduction as of yet

Steps to reproduce

1. Have a layout with virtualized lines that sometime wrap lines (and therefore differ from the size in estimateSize)
2. scroll up/down with the affected rows appearing/disappearing from the virtualized range

Expected behavior

Table layout should not jitter.

How often does this bug happen?

Every time

Screenshots or Videos

Screen.Recording.2026-08-11.151809.mp4

Platform

• OS: MacOS, Windows
• Browser: Firefox, Chrome
• @tanstack/react-virtual: 3.13.9 ... 3.14.9

tanstack-virtual version

3.14.9

TypeScript version

v7.0.0

Additional context

No response

Terms & Code of Conduct

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• I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.