Well, I am not 100% sure, but I think this is related to using smooth-scrollbar on the body element itself. Not that it is directly related to GSAP's ScrollTrigger, but idiotwu, the creator of smooth-scrollbar, himself advises on not doing so.   Edit: I've gotta correct myself on this. I thought, I remembered reading this in one of the issues of smooth-scrollbar over on Github, but actually the context was a whole different with what the creator said - and document.body
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