About A_ChangeFlag in the player's states

A_ChangeFlag("NOCLIP", 1) - does not work in the player states in decorate (gzdoom-4-6-1-Windows-64bit).

Post a runnable example. Please.

A_ChangeFlag("Noclip", 1) - Install this function in any player's state and you will see that it does not work. There is no need for a special example here.

This does not work because the player's NOCLIP flag is externally controlled and constantly changed.

But if you put a flag in the properties (+NOCLIP), everything works. What does it mean?