Weird Shadows

Hello, I've come across a strange mistake in the game. The way it looks is in the annex. I would ask for help because it doesn't look good. Is this a game error or do you need to change anything in the settings? Please help me quickly. I also think it may be a texture bug because it looks like Basalt texture from the Nether Update, but the same thing happened on version 1. 15. 2 (Sorry if i did any mistakes but i used translator becouse of writing it without it will took a lot of time)