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The zoom in will be close enough where the cluster icon is no longer necessary and the individual points can be selected.
The cluster will break up into clusters (Ex. a cluster of 4 will break into two clusters of 2 once zoomed in). These clusters can then be selected to zoom in further.
If the map reaches the maximum zoom level and points are still overlapping, then the selecting a cluster icons will not show and the will prompt a pop-up interaction (shown above) will take place.