[Webkit-unassigned] [Bug 220775] New: 14.0.2 seems to have broken some WebPs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220775

            Bug ID: 220775
           Summary: 14.0.2 seems to have broken some WebPs
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 10.15
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: e at ericportis.com

Some WebP images that worked on 14.0.1 on both Big Sur and iOS are broken on 14.0.2.

Test page: https://codepen.io/eeeps/pen/GRjLRrV

14.0.2
Big Sur screenshot: https://o.img.rodeo/14.0.2-webp/Screen_Shot_2021-01-20_at_10.20.36_AM.png
(left WebP fails, right WebP succeeds)
iOS 14.3 screenshot: https://o.img.rodeo/14.0.2-webp/IMG_4A1C1C0C29B3-1.jpg
(ditto)

14.0.1
Big Sur screenshot (via Browserstack...): https://o.img.rodeo/14.0.2-webp/Screen_Shot_2021-01-20_at_11.28.17_AM.png
(both images succeed)

Here's another test page for what seems like the same issue, and an associated support ticket for Cloudflare:
https://campaign.kurly.com/test/webp.html
https://community.cloudflare.com/t/fully-transparent-png-file-that-was-converted-webp-format-desnt-work-on-safari-14-0-2/231297)


This appears to be affecting some (not all) WebPs generated from both Cloudflare and Cloudinary.

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