What is causing this mobile scrolling issue on iOS with Safari?

What is the cause of this odd behavior as seen in the video? Is there a fix I can apply? (iOS iphone, Safari)

Video link here

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Any pano on my website, like this for example? (thx for checking btw)

Amazon Nitro Plaza, Denny Triangle, Seattle WA - 360 VR Panorama

Explore an interactive, high resolution 360° panoramic image by VR photographer ©Bradford Bohonus.

bohonus.com

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Hi Klaus, thanks for looking into that!

Removing the first portion from the div "pano" bit doesn't quite fix the issue. I still get the same result that is shown in the video in my first post. But oddly, in rare cases reloading the pano or closing the browser and reloading the exact same panorama, the issue is gone. To test/see this on your side with OS X Safari, I would recomend loading different panoramas (change the number in the URL for example).

HTML for each panorama is generated by script for each panorama dynamically, so I only need to make the change to the code once. I don't know yet if caching or something is screwing with it?

The second bit of javascript is inserted by Cloudflare and thus I don't have much control over that. It's part of their security bot protection type stuff.

It appears that Safari's TABS preference seems to be related~ I have my setting as "Single Tab" and thus the scrolling problem. When I change the preference to "Tab Bar", the problem goes away.

Note that panoramas I have created with Pano2VR do not have issues with either of these tab settings.

I have loaded 1.23.2 on my server now and the unwanted "scrolling" issue is gone, but there is a small black gap at the bottom of the browser window (pano not filling all vertical space) and when panning, the whole image jiggle's a bit, due to poor rendering performance I would expect?

Here's is a video showing the "jittering" that happens during panning.

https://bohonus.com/temp/panning.mov

Below you will find a screenshot that clearly shows the "gap" at the bottom that I am referring to.

As far as dragfriction="0.999"? Your own default is "0.9". I would assume that at one time your dragfriction parameter was not working and the only "fix" was having to change it to "0.999"? You have yourself suggested previously values of "0.95" as a "starting point" for dragfriction, but you find mine "annoying"? ok. I think at the time, I was trying to get the pano to coast a little bit before finally stopping, and the value I used was the only way to achieve that. So something must have changed again over the years to make the param setting continue to pan the image?

My iPhone is an iPhone 16 Pro, iOS v 18.6.2

Browser is Safari default.