Selection event bug, sometimes selection event doesn't call.

[mtleppay]

Codepen https://codepen.io/anon/pen/bJRPOL
Hello, I have a problem with selection event on chart. Sometimes event 'selection' doesn't call.
Only when i drag a selection it works correctly. When i'm trying to make new selection, event doesn't call.
Another example with same behavior https://apexcharts.com/javascript-chart-demos/area-charts/github-style/.
How can i call an event every time when selection changed?