QUOTE(aklfhl @ May 16 2025, 07:28)

It can be reproduced with Chrome DevTools. I used just "Mobile" as the user agent, worked on the main site but failed on lofi.
Edit: After further investigation it seems that lofi does use 780x for v1 galleries, but uses 1280x instead of 800x for v2 ones.
Hmm right, I see the problem. This should be fixed now, let me know if you still see this.
Also included a general temporary fix for the v2-converted-EXIF-rotated-v1-image-thumbnail-on-replaced-galleries issue. The aspect ratio won't be right for the replaced galleries, but at least it should use the correct thumbnail URL.