This has been going on since 1.16 but Idk why

I cant type 1.16 and other versions to Affects Version but the bug is, I was mining quartz in the nether, then suddenly, there was a surprise that blown my mind, The Ancient Debris generated at Y level 50+. I have seen this before while I was like creative doing nether builds at 1.16. This isn't fake! Its real! In the past when I upload this to YT someone thinks its fake but you gotta believe me, Im serious