List of steps to reproduce (step by step, including full links if applicable):
- Upload some PNG file
What happens?:
Recently, Wikimedia Commons cannot generate thumbnails for some of PNG images that I uploaded.
https://commons.wikimedia.org/w/index.php?title=Special:ListFiles/Meow&ilshowall=1
What should have happened instead?:
Thumbnails should be generated for the images successfully.