Found a big visual bug | chunks not showing

I found a big visual bug. Made a video, watch for yourself.:

https://youtu.be/k0hzzVi9Muk

 

It shows how I fly in a world and chunks are not showing properly.

I just uses the "/time set [...]" command. But if I go to the settings it goes back to normal. Maybe the Devs know what this is.

 

Regards

Just a Player that wants to help