MinY/MaxY not being respected w/ UNDERWATER Generator Type

[jaxmacky]

Pillar-1.2-10.jar
MC 1.12.2

Trying to spawn a structure within a specific Y level underwater, but Min/Max don't seem to work with UNDERWATER Generator Type. Maybe it's my confusion on how the Generator Types work.

`{
"generatorType": "UNDERWATER",
"minY": 0,
"maxY": 10,
"offsetX": 0,
"offsetY": 0,
"offsetZ": 0,

"mirrorType": "NONE",
"rotation": null,
"ignoreEntities": false,

"dimensionSpawns": [55],
"biomeNameSpawns": [],
"biomeTagSpawns": [],
"isDimensionSpawnsBlacklist": false,
"isBiomeNameSpawnsBlacklist": true,
"isBiomeTagSpawnsBlacklist": false,
"generateEverywhere": false,

"integrity": 1,
"decay": 0,

"filling": "minecraft:gravel",
"fillingMetadata": 0,
"fillingType": "WATER",

"rarity": 100

}`