Diamonds are very rare in edition 1.17.20.20

when i try to find diamonds i can't because i've dug many and many caves but i don't find any diamonds as if they were rare And like I've already created a world in the latest version but when I dig I don't find anything I just think just coal could you Fix it?

And this happened on 1.17.10.23 Until 1.17.20.20

and also it occurred in the bedrock Edition And also the generation of coal, iron and copper are normal