_Kukuruku_YT

This is probably a bug, but you should know that when you are lower then more textures are shown, and the computer voltage increases. And when higher then, in principle, only the sky and everything, so this is normal. But in principle, not (So please, moderators, write if you know more than me!

Please attach a photo if possible. Maybe you have something wrong with your computer hotkeys. Or in minecraft settings) This problem is solved like this: do what I said above, or just download minecraft again - (this has not been tested, but it works very often!).

Yes, most likely your computer is not very powerful. The solution to the problem: a new computer or better drivers (as mentioned in the comment above).

Yes, I think, this is dublicate for MC-239020) Or maybe this is not a bug, but just a generation?? Because seeds can be any! 

I think this is your computer because I'm doing great!

There is nothing strange here! It's just such a seed) Sids are different. And this is not a bug. If I'm wrong, then I'm sorry.