Turning off GIF & sticker autoplay sometimes squishes images

[nixRidge]

Describe the bug

When GIF and/or sticker autoplay is off, it squishes some image files, even non-animated files. Hovering them fixes the aspect ratio, but the images are cropped.

For example, this GIF sticker:

Screencast_20260308_055040.webm

And this 99x107 PNG

Screencast_20260308_055138.webm

Reproduction

1. Turn off sticker and GIF autoplay
2. Post any sticker or image

Expected behavior

The image is not cropped and maintains its aspect ratio.

Platform and versions

OS: Arch Linux
Browser: Firefox 148.0
Sable version: 1.5.1
Matrix homeserver: Synapse 1.148.0, tchncs.de

Additional context

I don't know what triggers it exactly, I tried uploading another 99x107 PNG which isn't affected by the bug, so it's seemingly random. It also happened with a non-animated sticker.

I haven't seen this happen with any emoji.

[7w1]

Had this happen during testing and thought i got it fixed. Oh well. It does seem oddly inconsistent but i’ll look into this in the next day or so.