PIDs for some processes aren't shown in "Session and Startup" > "Current Session"

Hello!

I'm using xfce4-session 4.14.2 (Xfce 4.14) on Ubuntu 20.04.1 LTS.

As the title says, PIDs for some processes aren't shown in "Session and Startup" > "Current Session"
Screenshot:

Thanks!

added 5. Current Session label

I can confirm on Xubuntu 20.04 and Xfce 4.16.