[Webkit-unassigned] [Bug 216926] New: Scroll container reverts back to previous snap point while the user is scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216926

            Bug ID: 216926
           Summary: Scroll container reverts back to previous snap point
                    while the user is scrolling
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: johannes.odland at nrk.no

Created attachment 409559

  --> https://bugs.webkit.org/attachment.cgi?id=409559&action=review

Video of the issue on an iPhone 11 Pro with iOS 14

Some users experience that the scroll container reverts to the previous snap point while they are scrolling. 
The issue might be caused by reflow. 

I've managed to reproduce the bug with a small example: https://codepen.io/johannesodland/pen/xxVmamJ

We've tested this on two similar iPhone 11 Pros on iOS 14. 
One of the phones snaps back to the original snap point while the user is scrolling. This does not happen on the other phone.

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