Stronghold can generate above surface

Done. I'm also the person that discovered the generation in my world on the game and the owner of the reddit post.

@@unknown, would you like to become the reporter and check and add affected versions (at least for releases)?

Another Reddit post reporting this issue is here: https://www.reddit.com/r/Minecraft/comments/awng1e/surface_stronghold_in_snapshot_19w09a_when_were/

Seed: 6270100715656620684
Coordinates: 5068 68 227