helgasoft commented on issue #19916:
URL: https://github.com/apache/echarts/issues/19916#issuecomment-2105060243
The series come from 4 different datasets, they can't have the same stack
id. Add the following code after _option_:
```
option.series = option.series.map((ss) => {
ss.stack= 'stak' + ss.datasetIndex;
return ss;
});
```
You could also use
[scroll](https://echarts.apache.org/en/option.html#legend.type) for the long
legend. 📌 please close issue if problem solved.

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