Noticed it when tapping the animated gif on "enwiki > tangent".
Tap on that image and you see the first image in the gallery instead of the animated gif.
- set a breakpoint inside "- (BOOL)isLargeEnoughForGalleryInclusion" after the "imageFromAppImageCache" line.
- load the "enwiki > tangent"
- tap the animated gif
- the breakpoint should trip, and you can see the image returned by "imageFromAppImageCache" is nil