Overview
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Scrolling is jumpy when playing a video inside of a container that uses `scroll-snap`. 


Steps to Reproduce
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1. Visit https://codepen.io/asdf/full/WNrmdPK
2. Play the video
3. Scroll to the right and left repeatedly 


Actual Results
--------------

Scrolling appears to jump around with significant jank.


Expected Results
----------------

Scrolling is smooth


Build Date & Hardware
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iOS 14 (18A5319i) iPhone and iPad


Additional Builds and Platforms
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- iOS 14 developer beta 1-3
- iOS 14 public beta


Doesn't Occur On 
----------------

- iOS 13 or previous
- Safari Technology Preview Release 110 (Safari 14.0, WebKit 15610.1.21.0.2)


Additional Information
----------------------

Here's a video demonstration: https://www.dropbox.com/s/i1jr4nul4uf15xh/scrolling.mp4?dl=0

Please let me know if there's any more information I can provide.

Thanks!