Affected image
Experienced on test.wikipedia.org, reproduced locally
https://upload.wikimedia.org/wikipedia/test/thumb/a/ae/2013-06-27_11.20.58.jpg/1024px-2013-06-27_11.20.58.jpg
https://upload.wikimedia.org/wikipedia/test/thumb/a/ae/2013-06-27_11.20.58.jpg/512px-2013-06-27_11.20.58.jpg
https://upload.wikimedia.org/wikipedia/test/thumb/a/ae/2013-06-27_11.20.58.jpg/256px-2013-06-27_11.20.58.jpg
https://upload.wikimedia.org/wikipedia/test/thumb/a/ae/2013-06-27_11.20.58.jpg/128px-2013-06-27_11.20.58.jpg
And as a result of the chaining, all sizes between buckets are broken in the same way as the bucket they're based on is.
Version: 1.25-git
Severity: normal
Attached: