MatthiasMert commented on issue #19658:
URL: https://github.com/apache/echarts/issues/19658#issuecomment-1968393725

   Your data contains a large number of `null` values at start and end. The 
property 
[connectNulls](https://echarts.apache.org/en/option.html#series-line.connectNulls)
 interpolates the line if **inbetween** two datapoints there a re `null` 
values. In Your case there is no datapoint to connect to in the beginning. You 
could add an auxiliary point at the beginning to combat that. Additionally, 
when zooming in, all data points outside of the view are filtered out which 
leads to the same problem. You can add 
[filterMode](https://echarts.apache.org/en/option.html#dataZoom-slider.filterMode)
 `'none'` to not filter out data but this will slow down performance.


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