The flexengine.exe will not help in my case, because i cannot use it without a manager.
i found a good workaround.
It would be to restart the "StartmenuExperienceHost.exe".
This will refresh the startmenu.
CMD
taskkill /f /im StartMenuExperienceHost.exe
Powershell
Stop-Process -Name "StartMenuExperienceHost" -Force
The Full artikel:
https://www.tenforums.com/tutorials/133178-restart-start-menu-windows-10-a.html
Question:
Now i need to know, whats the right Postaction script, if no appstack is connected? Any ideas?