solr relatedness weirdness on json facet function

[Dan Rosher]

Hi,

If I run a facet on relatedness on a qf field (examples below) which has
stopword removal, I get stopwords in the json facet?

Anyone know why, and if this can be avoided?

Many thanks,
Dan

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Details
Solr 7.7.2

http://localhost:8983/solr/collection/select?
q=my query&
defType=edismax&
qf=description&
fore={!type=$defType qf=$qf v=$q}&
back=*:*&
rows=0&
json.facet={
  "description":{
    "type": "terms",
    "field": "description",
    "sort": { "relatedness": "desc"},
    "mincount": 2,
    "limit": 8,
    "facet": {
        "relatedness": {
            "type": "func",
            "func": "relatedness($fore,$back)"
        }
    }
  }
}