Selectmarker doesn't work

[Znarf85]

Hi,

I installed the mediapicker and the callback works like a charm.
But the selectmarker doesn't work. If I click on an image, nothing happens.

I found a little workaround. If I delete this two lines in the code, the marker appears after a click.

// Empties state-arrays after callback:
this.setState({selected: []})
this.setState({selectedItems: []})

But this works only for one picture at a time.
If I click another one, the marker switched to the new picture and disappear from the old.

Is there a solution so it will work like on the demo-gif again?

Thanks and best regards