Steps:
Open Minecraft
Turn on Vibrant Visuals on a New World
Turn on Vibrant Visuals in Video Settings
Continue playing World Session
Expected: Vibrant Visuals
Actual Result: Black Screen
Things to note:
The brightness doesn’t work, and the game keeps running.
Can be changed back by switching to any other graphic option. (Fancy, Simple, Raytraced
This issue is being tracked at MCPE-203972.