Phone’s brightness doesn’t decrease smoothly when you start to reduce the brightness manually from 20% to 0%

Hi everyone! I have an iPhone 14. I wanted to ask users if you have such thing on your iphone: when you start to reduce the brightness manually very slowly from 20% to 0, the screen flickers a little bit at that time. Or if you start to increase the brightness from 0 to 20 % , but do it very slowly, the flickering happens again. It happens just at the moment of increasing and decreasing of brightness . Maybe it’s not like flickering, It looks like the brightness doesn’t decrease smoothly. In the static position of the brightness slider, the screen doesn’t flicker. When you start to increase brightness very slowly more than 20% (up to 100%), the flicker disappears and doesn’t appear. If you turn on the auto-brightness mode, and when the brightness slowly decreases less than 20 percent, the screen also starts flickering. When the slider stops, the flickering stops. it seems to me that this is the normal for iphones and other phones with OLED/AMOLED screens, my previous phone (Redmi note 10 pro with AMOLED screen) did something similar. For example, phones with IPS screens doesn’t have this.

I just wanted to know if anyone else has such thing.