When the woodland mansion is generated over water or empty space, it's base is generating all the way to to bottom until it reaches something solid but it stops at Y=0 instead of Y=-64
reproducible in seed = -8234810046665164343
coord: 213 / 61 / 153
[media]
The woodland mansion should not generate in the water like that to begin with. Resolving as a duplicate of MCPE-153203.