'StairBlocks' ignoring the data value.

[Marc Roosendaal]

Plugin version: 8.0.0 (BETA 5)

Spigot username: wazoomie

Issue It seems like the stairBlocks section, in biome configurations, ignores the data part and uses the default value of 0.

"stairBlocks": [
  ...
  [
    {
      "type": "WOOD_STEP",
      "data": 1,
      "chance": 1.0
    }
  ],
  ...
]

The expected result is to see spruce wooden slabs but instead there's oak wooden slabs.