`onSelected`: Keep default behavior of events

Is there any way to keep the default behavior of events while providing a handler?

From what I understand from this post, unless the overridden function returns false the default behavior should be kept. However, when I provide an onSelected method the default behavior doesn't happen, no matter what the returned value is.
TBH, I'm not sure whether what I'm asking for is the expected behavior, but depending on the answer you can interpret this question as a feature request or a request for document clarification.

To make this more clear, what I see when onSelected is not provided is that the selected area stays active even after mouse is released and you can even select multiple regions like so:

However, when onSelected is provided, the selected region disappears after the mouse is released and I cannot reproduce the same behavior (at least not so easily).
To give you more context, my specific use-case here is to be able to download the information of the selected points using a separate button that I have created, so the default visual response works well for me.

Die Issue nennt keine Quelldatei, keinen Test und keinen Einstiegspunkt. Beginne damit, den Unterschied zwischen der Plotly-Auswahl ohne einen onSelected-Handler und mit einem solchen zu reproduzieren, und vergleiche dann das onSelected-Verhalten der Komponente mit der verlinkten Plotly-Ereignisdokumentation. Als erledigt gilt die Aufgabe, wenn entweder die standardmäßige Darstellung der ausgewählten Region bei gleichzeitiger Verarbeitung des Ereignisses erhalten bleibt oder das erwartete Verhalten klar dokumentiert ist.