Steps to replicate the issue (include links if applicable):

• Navigate to this article https://en.m.wikipedia.org/wiki/A*_search_algorithm
• Scroll to the Description section
• View the maze image, tap on the maze image

What happens?:
On Android, the GIF does not animate in either article view or gallery view. On iOS, the GIF does not animate in article view, but does animate in gallery view.

What should have happened instead?:
The GIF should animate in both views.

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):
Tested on Pixel 6 on Android 15 and OnePlus 8 on Android 13. Tested on iPhone on iOS 18.6 and iPad on iPadOS 18.6.
Other information (browser name/version, screenshots, etc.):
I tested images from these pages, and they all worked fine:

• https://en.wikipedia.org/wiki/Category:Free_animated_images
• https://en.wikipedia.org/wiki/Category:Animated_images

This was reported by a user and communicated to me by @ARamadan-WMF