Ferdi: Ferdi does not autostart, when it is enabled in settings

[1Maxnet1]

Bug description:
When I enable autostart in the settings of ferdi, no entry is added in the autostart-settings and ferdi is not showing up after a reboot of my pc.

Steps to reproduce:

1. Go to settings
2. Flip the switch to enable 'Launch Ferdi on start'
3. Restart your computer
4. Ferdi is not showing up in the system tray or in the system autostart settings. The switch is disabled again.

Expected behavior
Ferdi should be visible in the system tray, an entry should be visible in the autostart-settings and the switch should be in state 'activated'

Environment:

• Operating System: KDE Neon 5.19 User Edition
• Ferdi Version: 5.5.0 (installed via FlatHub)
• Server: Franz

Debug information:
Sorry I can't get my debug information. I accidentally hid my menu bar and don't know how to get it back.

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[primeapple]

This bug is still present.

[1Maxnet1]

I tested it too with Manjaro KDE. Bug is present here to. I would really help to debug this, if someone could point me out on how to contribute.