Trying to configure the search portlet to display the categories as facets, the search view shows the categories twice (see attached image).

Steps to reproduce:
1. Create a vocabulary
2. Create 2 categories inside that vocabulary
3. Drag and drop search portlet on any page
4. Go to configuration (search portlet)
5. Select Advance in the Display Settings section
6. Paste the following JSON text in the Search Configuration text box to set categories as facets:
{"facets": [{
"displayStyle": "asset_vocabulary",
"weight": 1.3,
"static": false,
"order": "OrderHitsDesc",
"data": {
"maxTerms": 10,
"displayStyle": "list",
"frequencyThreshold": 1
},
"label": "category",
"className": "com.liferay.portal.kernel.search.facet.MultiValueFacet",
"fieldName": "assetCategoryIds"
}]}

7. Search by any word

The results view displays the categories twice.

Technical Comment: in the portal-web/docroot/html/portlet/search/facets/asset_vocabulary.jsp file (the selected display style)
we are getting the vocabularies twice if the scope and parent groups are the same:
assetVocabularies = AssetVocabularyServiceUtil.getGroupsVocabularies(new long[] {themeDisplay.getScopeGroupId(), themeDisplay.getParentGroupId()});