CustomWidget PopOver - Item from parameter does not use the configuration of the specific widget, but the last widget

Add-ons UIs
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2

Interesting that you (almost) achieved to do it like this.
I’d suggest another approach that is likely to work better:

Create a widget for the contents of your popover.
Define props for the title and the item.

uid: heating_control
props:
  parameterGroups: []
  parameters:
    - name: title
      label: Title
      type: TEXT
      description: The title
    - name: item
      label: Item
      type: TEXT
      context: item
      description: An item to control
tags: []
component: oh-slider-card
config:
  title: =props.title
  item: =props.item
  min: 10
  max: 25
  label: true
  scale: true

Then on your button use a popover action to open your other widget.

component: oh-button
config:
  ...
  action: popover
  actionModal: widget:heating_control
  actionModalConfig:
    title: =props.room
    item: =props.itemTargetTemp
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