When flying and exploring in creative, Invisible blocks appears when looking from a distance or going ahead of them.

I found invisible blocks when I explode the world, invisible blocks will appear and then it will unload for a few seconds or when looking from a distance.

 

Steps to reproduce:

1. Create a infinite world
2. Be in creative
3. Fly and explore the world
4. Some blocks will be invisible for seconds when going ahead of them, or when looking from a distance.