Steps to reproduce

1.  Build custom widget
2.  Select Matomo data supplier
3. Select dimension/metric => preview widget display correct data
4. Click "Add series"
5. Select value for metric

.. Logs, screenshots, gifs...

Expected results

Preview widget should display correct value for the first and second metric .

Actual results

Preview widget display double data for the first metric

Workaround

Development notes

The issue only happened with UI version 6.2.2

Happen at line 134 of info.magnolia.analytics.ui.app.fields.ChartTypeFormView#callWriteForm

this.write(chartDefinition);