Woodland Mansions can generate with a super tall cobblestone "foundation"

Not exactly a bug, as the entrace generates at ground level; the fact that it can generate on such elevated terrain may be worth looking into though.

Is this the only case found, or has anyone seen others?

(Note: Please don't start hunting for these. I wouldn't say it is a good use of time.)

I've seen I think 1 other occasion, but no longer have that world.

Found another one:

Seed: -1681023348413992357
Location: /execute in minecraft:overworld run tp @s -17583.44 104.12 -16575.73 -36.25 18.43

Granted, it's not as extreme, but it's still a huge foundation.

The cobblestone foundation seems used to prevent mansions floating.