Actually just visited the forum to finally comment about this (it has bothered me for a while now) after embedding a video at a max fitting width to the box, where the scroll bar behavior reminded me about it. Though for me I've found issues with it in general

In my video, you see the two issues I have with it. First of all - the shifting ruins some formatting, as you can see demonstrated in my badges literally turning into an F. Second is the glitchy aspect already mentioned.

I can't make sure suggestions since web dev isn't really my forte, but I feel like an appearing scroll bar that overlays the content instead of shifting it to the left would basically solve this issue.

(Slightly off topic, but I also think styling it would be beneficial too, it especially sticks out in dark mode. iirc it's pretty doable using webkit)