Next and previous buttons do not respect sort order

[sbraz]

Describe the bug
Hi,
When viewing photos sorted by Modified date and clicking next, the next file is the next by alphabetical order, not by modified date.
Nextcloud version: 32.0.2

To Reproduce
Steps to reproduce the behavior:

1. Go to a folder containing pictures
2. Click "Modified" to sort by modified date
3. Click a picture
4. Click next
5. The next picture is the next one in alphabetical order

Expected behavior
The next picture should be the next by modified date.

Screenshots

Pick an image:

Click next:

The wrong image is shown, it should have been 2025-11-22 13-46-55 (B,R2,S2).jpg instead

Desktop (please complete the following information):

• OS: Linux
• Browser Firefox
• Version 145

Browser log

[WARN] viewer: No files provided, skipping update 
Object { app: "viewer", uid: "sha1", level: 2 }

Additional context

This was reported a long time ago in https://help.nextcloud.com/t/the-order-of-the-previous-picture-and-the-next-picture-is-incorrect/130093/9