Strange sidebar scroll behaviour on long pages

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URL:

Any page that has a long enough content (e.g., https://nodejs.org/learn/modules/publishing-a-package#the-dual-package-hazard)

Browser Name:

Tried both Chrome and Safari

Browser Version:

Version 145.0.7632.117

Operating System:

macOS 15.7.3

How to reproduce the issue:

When I scroll down on a long page, the sidebar on the left has a strange behaviour. Where the section itself scrolls down in a weird when it shouldn't move at all

Screen.Recording.2026-07-21.at.19.14.58.mov