chunks disappear when you start the game (sometimes)

What I expected to happen was...:
Start normally the game.

What actually happened was...:
sometimes, many chuncks of the game close to me disappears, I try to walk and can't do it. It happened to me many times.

Steps to Reproduce:
1. Just i start the game and it only happens. Dunno how to make it. sometimes happens. Looks like the bug is gone when i restar the world, as shown in the video.