[bug]Sleep timeout not working

[happyBOY78]

I have Realme C3 on Android 10 with ColorOS 7.
When i want to change sleep timeout, it is not working for me. I want to change it for example from 1 min to 5 min, but nothing happened, it stay on old timeout.
Via phone system settings it is ok.
In tile preference is system permission allowed.

Thank for your help :-)

[Dre-OS]

Same problem here on Realme 5 on Android 10, Battery optimization is turned off for the app but still has no change in screen timeout whatsoever.