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Special:Homepage suggested edit panel uses non-standard thumbnail size
Closed, ResolvedPublicBUG REPORT

Description

Steps to replicate the issue (include links if applicable):

What happens?:
No image appears for some newcomer tasks / suggested edits

What should have happened instead?:
image should have loaded

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):
This was suggestion "Czech Television" which attempted to load https://upload.wikimedia.org/wikipedia/commons/thumb/5/51/Kav%C4%8D%C3%AD_hory_%C4%8CT_vstup_2.jpg/332px-Kav%C4%8D%C3%AD_hory_%C4%8CT_vstup_2.jpg

Event Timeline

Restricted Application added a subscriber: Aklapper. · View Herald Transcript

I tried it out and noticed it failing for the article https://en.wikipedia.org/wiki/Bamako_(album) when it tried to request the following thumbnail
https://upload.wikimedia.org/wikipedia/en/thumb/8/8a/OGJB_Quartet_Bamako.jpg/332px-OGJB_Quartet_Bamako.jpg which resulted in a 400 http status.

On enwiki wmf.24 there are quite few examples that fail to display an image. May be it's not related but the issue was present only for Revise Tone task.

(1) Checked in Chrome and FF. FF complains:

GET
https://upload.wikimedia.org/wikipedia/en/thumb/0/0b/BEASTONMYBACK_preview.jpg/332px-BEASTONMYBACK_preview.jpg
NS_BINDING_ABORTED

A resource is blocked by OpaqueResponseBlocking, please check browser console for details. 332px-BEASTONMYBACK_preview.jpg
Image corrupt or truncated.

(2)

Screenshot 2026-04-29 at 6.22.00 PM.png (2,898×1,676 px, 524 KB)

Request URL
https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Miroslav_Ivanov.jpg/332px-Miroslav_Ivanov.jpg
Request Method
GET
Status Code
400 Bad Request
Referrer Policy
origin-when-cross-origin

(3) Another example:

Screenshot 2026-04-29 at 6.14.11 PM.png (1,134×1,404 px, 170 KB)

<div class="suggested-edits-task-card-wrapper"><a href="https://en.wikipedia.org/wiki/Special:Homepage/newcomertask/54020590?geclickid=206ocktfd03qemhfktdm4p24027vvdrf&amp;genewcomertasktoken=ioqq64aqib0k9tc90ahdmn4bm7s3puvo&amp;gesuggestededit=1&amp;getasktype=revise-tone" class="se-card-content"><div class="se-card-image no-image mw-ge-tasktype-revise-tone skeleton"></div><div class="se-card-text" dir="ltr"><h3 class="se-card-title">PMR Records</h3><div class="se-card-extract">PMR Records is an independent record label founded by Ben and Daniel Parmar in 2011. Initially building recognition as a quintessentially British outlet plugged in to local dance/electronic music culture, with a keen awareness of the trajectory of pop music, PMR was responsible for the early development of Disclosure, Jessie Ware, Ruti and Jamie Woon who have gone on to have mainstream success. It also nurtured specialist dance/electronic music acts such as Julio Bashmore and T.Williams.</div><div class="se-card-pageviews"><span class="oo-ui-widget oo-ui-widget-enabled oo-ui-iconElement oo-ui-iconElement-icon oo-ui-icon-chart oo-ui-labelElement-invisible oo-ui-iconWidget"></span>769 visits (past 60 days)</div></div></a></div>
GET
	https://upload.wikimedia.org/wikipedia/en/thumb/5/55/PMR_Records_Logo_October2022.jpg/332px-PMR_Records_Logo_October2022.jpg
Status
400
VersionHTTP/2
Transferred9 03 B (0 B size)
Referrer Policystrict-origin-when-cross-origin
Request PriorityHighest
DNS ResolutionDNS over HTTPS

    	
    access-control-allow-origin
    	*
    access-control-expose-headers
    	Age, Date, Content-Length, Content-Range, X-Content-Duration, X-Cache
    content-length
    	2146
    content-type
    	text/html; charset=utf-8
    date
    	Wed, 29 Apr 2026 22:35:54 GMT
    nel
    	{ "report_to": "wm_nel", "max_age": 604800, "failure_fraction": 0.05, "success_fraction": 0.0}
    report-to
    	{ "group": "wm_nel", "max_age": 604800, "endpoints": [{ "url": "https://intake-logging.wikimedia.org/v1/events?stream=w3c.reportingapi.network_error&schema_uri=/w3c/reportingapi/network_error/1.0.0" }] }
    server
    	Varnish
    server-timing
    	cache;desc="int-front", host;desc="cp1103"
    strict-transport-security
    	max-age=106384710; includeSubDomains; preload

Change #1285758 had a related patch set uploaded (by Sergio Gimeno; author: Sergio Gimeno):

[mediawiki/extensions/GrowthExperiments@master] GrowthTasksApi: fix thumnail width in default AQS config

https://gerrit.wikimedia.org/r/1285758

Sgs subscribed.

The requests are being blocked because of the thumbnail size not matching any standard size in

See for instance:

We seem to be at the culprit, pushed a fix. Not sure what is or was the channel to subscribe to get updates about this. Anyways I don't think it changes thaat often.

Sgs moved this task from Needs Refinement to FY2025-26 Q4 Sprint 2 on the Growth-Team board.
Sgs edited projects, added: Growth-Team (FY2025-26 Q4 Sprint 2); removed: Growth-Team.
Sgs moved this task from Incoming to Code Review on the Growth-Team (FY2025-26 Q4 Sprint 2) board.

Change #1285758 merged by jenkins-bot:

[mediawiki/extensions/GrowthExperiments@master] GrowthTasksApi: fix thumbnail width in default AQS config

https://gerrit.wikimedia.org/r/1285758

DMburugu subscribed.

Seems like the thumbnails are being fetched with the appropriate configuration now so I'll resolve this.

Screenshot 2026-05-21 at 17.35.56.png (2,596×2,000 px, 1 MB)