treemap 属性emphasis.label.formatter不生效

[haojay5]

Version

4.5.0

Steps to reproduce

 emphasis: {
            itemStyle: {
                color: 'red'
            },
            label: {
                show: true,
                color: 'black', //'rgba(255,255,255,1)'
                formatter: function(params) {
                    return 'test'; //params.name   '\n{hr|}';
                },
                rich: {
                    hr: {
                        borderColor: 'rgba(255,255,255,1)',
                        width: '100%',
                        borderWidth: 1,
                        height: 0
                    }
                }
            }
        },

What is expected?

激活的文字应该按格式化的结果显示

What is actually happening?

事实是文字颜色可以变化，格式化不生效

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