Iron not generating

Hello,

Its my first post so i'm sorry if i don't write and explain my issue correctly...

When i generate a world, there is no iron regardless of the Y level. Still, there is a lot of copper and maybe there is more than it should be, i suspect iron being replaced with copper but i'm not sure, i can't screen because of my laptop performance, but i already created 2 worlds one on my test server (vanilla snapshot 27w08a), one in solo and a third after restarting the launcher

edit : okay i suppose at least iron to not have correct spawn rate, but i finally found in the third world iron beneath Y = 0 but like 1 iron by 1 and not in vein like we should properly find.