Main menu ignores firejail

Distribution

Mint 22

Package version

6.2.7+wilma

Graphics hardware in use

No response

Frequency

Always

Bug description

I try to make Telegram launches inside firejail. But Cinnamon ignores any changes inside a Telegram.desktop or with the menu editor. It always launches itself.

Steps to reproduce

1. Open main menu editor
2. Select Telegram item
3. Click on a "Properties" button.
4. Prepend 'firejail' into command text field
5. Launch Telegram

OR

1. Open main menu editor
2. Select Telegram item
3. Click on a "Edit desktop file" button.
4. Prepend 'firejail' to a 'Exec' property to make like this 'Exec=firejail /opt/Telegram/Telegram -- %u'
5. Launch Telegram

Expected behavior

Telegram launches inside firejail. Command ps -ax contains 'firejail /opt/Telegram/Telegram' or firejail --list output is not empty.

Additional information

I have no idea how can it be. I tried to use update-desktop-database, edited .desktop without menu editor - directly in ./.local/share/applications, wrote full path to firejail - nothing helped. I'm not sure is this Cinnamon issue but I don't know how to investigate this trouble more.

Thank you.

Reproduce the launch from the Cinnamon main menu editor using the Telegram.desktop entries described in the report. Compare the edited Exec value with the file under .local/share/applications and check update-desktop-database behavior, then verify the result with ps -ax or firejail --list. Done means Telegram launched from the menu shows firejail in the process evidence.