"Stop system app" is not working?

"Stop system app" is not working?

Hi! I am using MDM for an Android Samsung Knox phone, I already restricted the option "Stop system app" in the Profile -> Restriction -> Application. But after it was deployed to the phone, when I checked, so many system apps still can press "Force stop" in the app control setting, this option is not greyed out. I don't know how this restriction works. Is there any problem?

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