ListView.onAdd handler only is triggered for some limited consecutive times

Step to reproduce

1. Run sample code ListViewBug.7z
2. Click on Add item button several times and observe console output

Expected result

ListView.onAdd should be triggered everytime a new item is added to the list.

Actual result

When adding item to the list for some consecutive times, which mean not any other actions happen in between, console output only shows some limited time ListView.onAdd is triggered. For more specific, 2 times for Horizontal ListView and 8 times for Vertical ListView.