Uncaught Error: Map container is already initialized.

When loading a Leaflet map with Leaflet Marker Clusters in a view that uses Ajax, the error;

Uncaught Error: Map container is already initialized.

Will happen on the second search. First search will work, second will not.

Solution was entirely stolen from this comment; https://www.drupal.org/project/leaflet/issues/2808957#comment-12490809 →

Because Marker Cluster overrides the `Drupal.behaviors.leaflet`, we also have to apply that fix here. On applying that fix, I can successfully run searches one after another.

Patch in next comment