NavBar : Empty background is still there when the navbar disappears

Description

Background is still there when the navbar disappears, during a swipe up on the video view for example.

Expected behavior

We should see the items underneath when it disappears

Actual behavior

We don't.

Steps to reproduce

1. Just swipe up on the video view

Screenshot / video

Context

App version

3.3.0

Android version

8.1.0

Device model

Moto G5 Plus XT1685

Smartphone