Scrolling does not work correctly.

Describe the bug

Scrolling does not work correctly. I thought the problem was with the position: sticky table header, but no.

Your minimal, reproducible example

https://codesandbox.io/p/devbox/mystifying-dew-t5nd7v?workspaceId=ws_G2EwNr8rBvsbnPfjfHKzRb

Steps to reproduce

Let's take a basic example from https://tanstack.com/table/v8/docs/framework/react/examples/virtualized-rows and add a button (for example, scroll to the last element).

Expected behavior

We expect: when you click on the button, you will see 50,000 items. Reality: we not see element 50000.

How often does this bug happen?

Every time

Screenshots or Videos

No response

Platform

windows, edge

tanstack-virtual version

3.13.14

TypeScript version

No response

Additional context

No response

Terms & Code of Conduct

• I agree to follow this project's Code of Conduct
• 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.

Start with the linked CodeSandbox and the TanStack Table virtualized-rows example, then reproduce the button action that should scroll to item 50,000. Trace the virtualized scrolling entry point and compare the observed position with the expected last-item visibility; done means the button reliably reveals item 50,000 on the reported setup.