Minecraft generates new world bugged?

Hi, as you can see from the pictures, Minecraft generates my world bugged. I've already tried to create a new world, but nothing worked. I have already restarted my PC, it did not help. How can I solve this problem?

Probably some mods or texture packs are to blame.

In my opinion, this is due to the texturepack

Should be the grass what it can't indicate. See if your TP is running on the latest version and if not, you have to update it.

You have a TexturePack in there, which is most likely the reason.

I don't think it's a bug but simply because of your texture pack which is not for the version you started. As you can see, grass and wood are affected. Just try a different texture pack or just don't take one and it should be gone. Before you put in a texture pack that is not for the version, you will also be pointed out again that it is not for the version and that such things can come out of it.

It helped, but now I have FPS drops all the time and the game doesn't run smoothly at all. Before that it was still going perfectly. What can I do against it?

First restart MC, then you can try to allocate more RAM to Minecraft (if you haven't already done so).

Otherwise, see if you have the latest version of optifine on it (if not → update).

Usually the texture pack doesn't have that much impact on performance unless you're using a very high resolution one.

Followed the steps, the laggs were only partially reduced. But it is still lagging.