`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.

该 issue 没有指定源文件、测试或入口点。首先复现 Plotly 在没有 onSelected 处理器和有 onSelected 处理器时的选择差异，然后将组件的 onSelected 行为与链接的 Plotly 事件文档进行比较。完成的标准是：要么在处理事件的同时保留默认的选中区域视觉效果，要么清楚地记录预期行为。