api/org.kryptonmc.api.world.dimension/DimensionType/logicalHeight

logicalHeight

@get:JvmName(name = "logicalHeight")
abstract val logicalHeight: Int

The maximum logical Y level that can be built at.

For example, in the nether, there is a bedrock roof at 128 blocks, so the logical height for the nether is 128, as whilst you can still build above he nether roof, it is not intended for you to do so.