It seems like pretty much all thumbnails are broken on arywiki. Presumably there is a misconfiguration in swift. Original image assets seem ok and images from commons are fine.
Original report: https://www.mediawiki.org/wiki/Topic:Xa48l2j22xg953la
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I remember this wiki was not very cooperative when we were creating it. Something must have messed up there.
Running this fixed it:
ladsgroup@mwmaint1002:~$ mwscript extensions/WikimediaMaintenance/filebackend/setZoneAccess.php --wiki=arywiki --backend=local-multiwrite