Ginqus this could just be causing from a setting in Developer Mode.
Try deactivating it.
Also, Any app you might have downloaded from playstore has something to do with it!
Trust me I am a new phone 3a user from India. My use is limited but leaving the GPS and almost always on 5G has not hampered my Screen On Time.
My Phone 3A experience has been Positive. And I have made Sure the settings I keep are to my liking and maybe there is some role in it for my positive experience.
Keep us posted ! Hope you figure it out!