When an Accordion widget is embedded in another container e.g. a ListView, then clicking the collapse/expand toggle not only triggers the Accordion to collapse/expand but also the triggers the on-click event of the surrounding ListView.
The behavior is different from e.g. buttons which (as far as I can tell) do stop the event propagation.
This makes the Accordion basically unusable in such scenarios and it doesn't seem to make sense in any scenario.
Tested in Studio Pro 10.8.0