How to make multipart in blockstate?

I make wires and i need connection 2 wires block.

I have BooleanPropertys registered, but in mod loading it show Unknown the property in assets/wuntare/blockState.

	public static final BooleanProperty CONNECTED_NORTH = BooleanProperty.create("connected_north");
    public static final BooleanProperty CONNECTED_SOUTH = BooleanProperty.create("connected_south");
    public static final BooleanProperty CONNECTED_WEST = BooleanProperty.create("connected_west");
    public static final BooleanProperty CONNECTED_EAST = BooleanProperty.create("connected_east");
    public static final BooleanProperty CONNECTED_UP = BooleanProperty.create("connected_up");
    public static final BooleanProperty CONNECTED_DOWN = BooleanProperty.create("connected_down");
    
    public CopperWireWithoutInsulation0(Properties properties) {
        super(properties);
        this.registerDefaultState(this.stateDefinition.any()
            .setValue(CONNECTED_NORTH, false)
            .setValue(CONNECTED_SOUTH, false)
            .setValue(CONNECTED_WEST, false)
            .setValue(CONNECTED_EAST, false)
            .setValue(CONNECTED_UP, false)
            .setValue(CONNECTED_DOWN, false));
    }
    
    @Override
    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> builder) {
        builder.add(CONNECTED_NORTH, CONNECTED_SOUTH, CONNECTED_WEST, CONNECTED_EAST, CONNECTED_UP, CONNECTED_DOWN);
    }

In this part blockState have problem

"multipart": [
    {
      "apply": {
        "model": "wuntare:block/copper_wire_without_insulation0"
      }
    },
    {
      "when": { "connected_north": true },
      "apply": {
        "model": "wuntare:block/copper_wire_without_insulation0_north"
      }
    },