[1.15.2] MultiPartBlockStateBuilder doesn't synthesize a valid blockstate file when 'useOr' is included in the definition

[MongoTheElder]

When using MultiPartBlockStateBuilder to synthesize blockstate JSON files using the 'useOr()' method, the resulting JSON doesn't conform to the required blockstate format.

Attempting to load the synthesized file returns:

'Mod Resources': Expected OR to be a JsonArray, was an object ({"no...e"})

 

For example:

builder.part().modelFile(model).addModel().useOr().condition(MyBlock.NORTH, true).condition(MyBlock.SOUTH, true);

produces:

{
"multipart": [
  {
    "when": {
       "OR": {
          "north": true,
          "south": true
          },
    "apply": {
      "model": "mymod:block/my_block"
    }
  }
}

but it should produce:

{
"multipart": [
  {
    "when": {
       "OR": [
          { "north": true },
          { "south": true }
          ]
    },
    "apply": {
      "model": "mymod:block/my_block"
    }
  }
}

 

Looking at the code, there doesn't seem to be any way to force the JSON builder to render the condition as an array of maps instead of a single map.