Also, you can update the component to get rid of the duplicate full-screen button.
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If it's of some use for you then it's perfect but beware of the side effect if you want to include it in future update. It's working correctly only if max zoom is set to 20, if lower, the cluster still disappears on click what's sort of logical looking at the context. In fact, if you want to include it, I think you should force max zoom to 20 (or disable the setting) if custom library is chosen for the clustering.
But preventing the zoom on click for cluster in which all users are sharing the same position could probably fix that too. I tried playing a bit with your code but did not find the correct change to achieve it. I am not sure I will find the time to take a better look at it this week but if I find something, I'll sure come back to you.
I tried to avoid this zooming function on cluster with users having the exact same location but actually I still did not find a correct way to achieve it without getting something else broken.
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