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File on officewiki fails to thumbnail (shows errors in MultimediaViewer)
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Description

A specific file on officewiki is failing to render a thumbnail (shows errors in MultimediaViewer): https://office.wikimedia.org/w/thumb.php?f=Bartosz_Dziewoński_–_desk_2016-09-02.jpg&width=1280

image.png (980×1 px, 54 KB)

Same file renders at other sizes, e.g. https://office.wikimedia.org/w/thumb.php?f=Bartosz_Dziewoński_–_desk_2016-09-02.jpg&width=800

This also results in an error message in MultimediaViewer: https://office.wikimedia.org/wiki/Category:Remote_office#/media/File:Bartosz_Dziewoński_–_desk_2016-09-02.jpg (depending on your screen resolution, it might load in other sizes for you, and not give an error)

image.png (980×1 px, 99 KB)

Event Timeline

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If I fetch the URL with no cookies I get the same 404 error and X-Cache-Status: hit-front (unlike the working URLs which correctly return an access denied page and X-Cache-Status: pass). So I guess this got messed up in Varnish somehow. (And probably MediaWiki is sending the wrong Vary headers on 404.)