Last modified: 2013-10-30 23:45:27 UTC
Probably the case that the thumbnail gets stuck in but gets immediately replaced...
Change 92438 had a related patch set uploaded by MarkTraceur: Load thumbnails, use loading image in core https://gerrit.wikimedia.org/r/92438
We are now changing our original thumbnail proposal to show a loading icon while loading big images.
Change 92438 merged by jenkins-bot: Load thumbnails, use loading image in core https://gerrit.wikimedia.org/r/92438
This appears to be now done.