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Cannot find the reason lock screen still pops up after inactivity (Win 10)

I’m running Windows 10 Home (build 19044.2006) on Asus UX481FL and the lock screen always pops up after inactivity timeout.

Screen Saver Settings > "On resume, display logon screen" is off
Sleep is "Never"
Hibernate is "Never"
System unattended sleep timeout is 999999min (for some reason it doesn't switch to "Never")
Sign-in options > "Allow Windows to automatically lock your device when you're away" is off

What else do I have to check?