Mixed/Combo Chart not working

[FynnFlueggeFletec]

Hi,
I want to draw a Combo Chart with Bars and Lines as in this example https://apexcharts.com/javascript-chart-demos/mixed-charts/line-column/ but I got a chart with only lines and no columns/bars when I implement it as described in the Apexcharts documentation.

private fun createChart(): ApexCharts {
    return ApexCharts().apply {
      setSeries(*createSeries().toTypedArray())
      setChart(Chart().apply {
        type = Type.line
        background = "transparent"
        toolbar = Toolbar().apply { show = false }
        height = "300px"
      })
      setPlotOptions(PlotOptions().apply {
        bar = Bar().apply {
          horizontal = false
          columnWidth = "25%"
        }
      })
    }
  }

private fun createSeries(): List<Series<Double>>{
    val series0 = Series<Double>().apply {
        SeriesType.column
        data = arrayOf(1.0,2.0,3.0)
      }

    val series1 = Series<Double>().apply {
      SeriesType.line
      data = arrayOf(4.0,5.0,6.0)
    }

    return listOf(series0, series1)
  }

Expected behavior
The chart should contain three x-axis samples with one bar graph and one line graph.