Igloo's basement can be cut off

There's a 50% chance an igloo has a basement underneath it, but due to odd world generation, an igloo can be chosen to have a basement by the generation, but the basement is cut off because of the environment. An igloo can have a trapdoor, but no basement underneath it.

Seed: -3038033905908571340
Coordinates: /tp @p 8755 66 597