`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.

此 issue 未指定原始檔案、測試或進入點。先重現 Plotly 在沒有 onSelected 處理器與有 onSelected 處理器時的選取差異，然後將元件的 onSelected 行為與連結的 Plotly 事件文件進行比較。完成的標準是：要麼在處理事件的同時保留預設的已選取區域視覺效果，要麼清楚地記錄預期行為。