User blog comment:DaNASCAT/Technical Update: March 6, 2017/@comment-3293097-20170310081940

There still seems to be a quality issue with .png images. I've cleared my cache and waited a while since the update, so I don't think that would be the problem.

Will the thumbnails of .png images ever return to their full quality, or will we have to stick to downloading them to be able to edit them pixel by pixel, instead of simply being able to copy the thumbnail? I ask mainly because the wiki I work on is heavily dependent on small, pixel perfect images, which have appeared lower in quality both since the adoption of WebP and the supposed quality fix this update brought.