Oh-repeater not working for oh-time-series in oh-chart

Hi together,

I try to create a Widget that shows multiple Temperature Curves in a Diagram for Placement on e.g. a Page.

I have written the below Widget. It works if I put multiple oh-time-series in the series-Property of the oh-chart component.
But I would like to use the oh-repeater to show a series for each Item in a group or for each item with a given Tag.
The oh-repater Part works with list-items in a oh-list. But it seems it does not work for oh-time-series in an oh-chart series-Property.

Am I doing something wrong?
Any hints?

I added a Screenshot. The base Diagram Controls are Visible, but the Series are missing.

Thanks in Advance.
JoeD

yaml
uid: widget_db26662fce_ChartWidget
tags: []
props:
  parameters:
    - description: A text prop
      label: Prop 1
      name: prop1
      required: false
      type: TEXT
    - context: item
      description: An item to control
      label: Item
      name: item
      required: false
      type: TEXT
  parameterGroups: []
timestamp: Jun 8, 2021, 9:18:20 PM
component: f7-card
config:
  title: '=(props.item) ? "State of " + props.item : "Set props to test!"'
  footer: =props.item
slots:
  content:
    - component: oh-chart
      config:
        chartType: dynamic
        period: 2D
      slots:
        grid:
          - component: oh-chart-grid
            config:
              includeLabels: true
        xAxis:
          - component: oh-time-axis
            config:
              gridIndex: 0
        yAxis:
          - component: oh-value-axis
            config:
              gridIndex: 0
              name: °C
              scale: true
        series:
          - component: oh-repeater
            config:
              for: item
              groupItem: gTemperaturenAussen
              sourceType: itemsInGroup
            slots:
              default:
                - component: oh-time-series
                  config:
                    name: =loop.item.name
                    gridIndex: 0
                    xAxisIndex: 0
                    yAxisIndex: 0
                    type: line
                    item: =loop.item.name
        tooltip:
          - component: oh-chart-tooltip
            config:
              confine: true
              smartFormatter: true
        legend:
          - component: oh-chart-legend
            config:
              bottom: 3
              type: scroll
        dataZoom:
          - component: oh-chart-datazoom
            config:
              type: inside

  • Platform information:
    • Hardware: 2GB Ram
    • OS: openHABian
    • Java Runtime Environment:
      javaVersion: 11.0.11
      javaVendor: Azul Systems, Inc.
      javaVendorVersion: Zulu11.48+21-CA
    • openHAB version: openHAB 3.1.0.M5