Solr Location facet is not multiple select anymore, as Spaces used to be

With the move to nested documents, the solr facet "Spaces" has turned into "Location", to correspond to the new concept.

However, if in the spaces filter it was possible to select multiple spaces (by checking the boxes) and have all the results in these spaces, in the location filter once a "top level location" is selected, the facet's display turns into a location display, does not stay a list of checkboxes and another location from the same level cannot be selected, only locations under the chosen location will be available for selection, allowing to refine the search.