jinliming2 opened a new issue #14188:
URL: https://github.com/apache/echarts/issues/14188
### Version
5.0.1
### Steps to reproduce
```js
option = {
angleAxis: {
},
radiusAxis: {
type: 'category',
data: ['周一', '周二', '周三', '周四'],
z: 10
},
polar: {
},
series: [{
type: 'bar',
data: [3, 2, 3, 4],
coordinateSystem: 'polar',
showBackground: true,
name: 'A',
stack: 'a',
emphasis: {
focus: 'series'
}
}],
legend: {
show: true,
data: ['A', 'B', 'C']
}
};
myChart.showLoading();
```
### What is expected?
Loading 字样应该显示在最上层
### What is actually happening?
Loading 文字被阴影下面的图表遮挡

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