Hi ECharts Engineering Team, Thanks for developing and maintaining such a great visualizations library.
We are currently exploring the opportunity to use it in our product and sometimes we encounter rough edges that cannot be fixed outside of the library. One of the issues is that the `connectNulls` does not fully work on stacked area charts so I created a pull request that fixes it. I would deeply appreciate it if you could have a look at it and provide feedback if something needs to be changed. PR: https://github.com/apache/echarts/pull/19602 Best, Aleksandr
