`showItemInFolder` does not open correct item location when run in snap

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

39.2.7

What operating system(s) are you using?

Ubuntu

Operating System Version

24.04

What arch are you using?

x64

Last Known Working Electron version

No response

Does the issue also appear in Chromium / Google Chrome?

No

Expected Behavior

showItemInFolder should do as advertised and open the folder location of an item. For example:

shell.openItemInFolder("/home/username/Downloads/file.txt");

This should open the file browser to the user's Download folder and select "file.txt".

Actual Behavior

When using Electron Fiddle or running from an uncompressed .tar.gz distribution, this works as expected.

However, when running from a standard (vs. classic) snap, the file browser opens to the user's home directory and no deeper. This happens even when the snap is connected to the :home slot, and should have permissions to open user directories.

Testcase Gist URL

No response

Additional Information

Based on #33804