Ancient debris nothing in nether

Hyy mojang, please fix minecraft version 1.16.10 because after I update it world in nether minecraft, a short story after the update I really wanted to find the ancient debris block then I used to use x-ray to make it easier after searching for about 1 hour I searched for why there was no right when I changed the world in minecraft there is an ancient debris please mojang fix this bug because it is very detrimental thank you, please read mojang