Home bar disappearing from time to time

On Oneplus 7 pro, the home bar the bottom of the screen disappears sometimes. I don’t know how to reproduce the bug.
But to fix it temporary, you can enter any app and pull down the notification menu. Then the home bar reappears.

Caption: there should be a white bar here

A suggestion could be to Auto hide the search bar. Like, When scrolling it hides… Or… When scrolling down it hides. And then while scrolling up it pops out. Something like that.