Ancient Debris spawns too high

I made a world and started destroying the nether with beds, and I came across ancient debris on Y level 89. Ancient debris should only spawn up to Y level 22. The seed was -269606623 and the coordinates were 471, 88, -104.

Steps to reproduce:

1. Go into Minecraft.
2. Create a world with the seed -269606623.
3. Build a nether portal, light it, and enter the nether.
4. Type /tp @s 471 88 -104

Expected result: There is no Ancient Debris because it is Y level 88.

Actual Result: There is a patch of 2 Ancient Debris blocks right next to player.