Gosh, that took a lot of effort to chase down...here's the minimal demo that isolates the issue and proves that it's totally unrelated to GSAP:    See the Pen YzLZVOz by GreenSock (@GreenSock) on CodePen   In Safari 16, if you set overscrollBehavior to none on the body/html, and then set scrollTop of a fixed element, it totally breaks the scroll of the entire page!   Pretty weird, right?    I reported it: https://bugs.webkit
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