Show multiple opened clusters

[p3x-robot]

• I'm reporting a bug, not asking for help
• I'm sure this is a Leaflet.MarkerCluster code issue, not an issue with my own code nor with the framework I'm using (Cordova, Ionic, Angular, React…)
• I've searched through the issues to make sure it's not yet reported

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How to reproduce

• Leaflet version I'm using: Latest
• Leaflet.MarkerCluster version I'm using: Latest
• Browser (with version) I'm using: Latest Chrome
• OS/Platform (with version) I'm using: Linux Mint 20
• I cannot show multiple clusters opened at once.

What behaviour I'm expecting and which behaviour I'm seeing

When I open a cluster, the previous closes it. So, I cannot show multiple clusters opened at once.

Minimal example reproducing the issue

• this example is as simple as possible
• this example does not rely on any third party code

Using http://leafletjs.com/edit.html or any other jsfiddle-like site.

[LamprosPitsillos]

Is this still true ? i would like to have multiple open/spiderified clusters