Certain shortcuts are reset to default on the next program launch

[Pocaross]

Distribution

Linux Mint 21.2 Cinnamon; cinnamon version 5.8.4; linux kernel 5.15.0-79-generic

Package version

pix 3.0.2

Frequency

Always

Bug description

First four shortcuts for "show next file" or "show previous file" are reset to default on the next program start, while other save their new values.

Steps to reproduce

1. open pix preferences -> shortcuts -> viewer;
2. remap any of the first four shortcuts of "show next file" or "show previous file" in the list (in my case it was "up"->"4" and "down"->"5" to free those keys for other shortcuts);
3. close and open the program again - remapped shortcuts are back to default;

Expected behavior

Shortcut changes persist on the next program launch

Additional information

No response