Boolean similarity module with fuzzy search scoring

Elastic Stack Elasticsearch
1

I've updated the default similarity module for my index to be boolean. The score should only be based on whether the query terms match or not.

Boolean similarity gives terms a score equal to their query boost

However, when I do a fuzzy search, I am not getting a score equal to the boost value. Is this a bug? Is there a configuration I'm missing to just use the query boost value for the score when doing a fuzzy search? e.g. Here is the relevant part of my query:

    {
      "query": {
        "multi_match": {
                    "fields": [
                      "canonicalName_EN.prefix^1000"
                    ],
                    "minimum_should_match": "4<80%",
                    "query": "boston",
                    "fuzziness": "AUTO",
                    "prefix_length": 2,
                    "type": "best_fields"
                  }
      },
      "size": 6,
      "_source": ["display_EN"]
    }

And here is the explain:

    {
      "value": 3300.0,
      "description": "sum of:",
      "details": [
        {
          "value": 800.0,
          "description": "weight(canonicalName_EN.prefix:bosto in 58400) [PerFieldSimilarity], result of:",
          "details": [
            {
              "value": 800.0,
              "description": "score(, doc=58400), computed from:",
              "details": [
                {
                  "value": 800.0,
                  "description": "query boost",
                  "details": []
                }
              ]
            }
          ]
        },
        {
          "value": 1000.0,
          "description": "weight(canonicalName_EN.prefix:boston in 58400) [PerFieldSimilarity], result of:",
          "details": [
            {
              "value": 1000.0,
              "description": "score(, doc=58400), computed from:",
              "details": [
                {
                  "value": 1000.0,
                  "description": "query boost",
                  "details": []
                }
              ]
            }
          ]
        },
        {
          "value": 833.3333,
          "description": "weight(canonicalName_EN.prefix:boston  in 58400) [PerFieldSimilarity], result of:",
          "details": [
            {
              "value": 833.3333,
              "description": "score(, doc=58400), computed from:",
              "details": [
                {
                  "value": 833.3333,
                  "description": "query boost",
                  "details": []
                }
              ]
            }
          ]
        },
        {
          "value": 666.6666,
          "description": "weight(canonicalName_EN.prefix:boston h in 58400) [PerFieldSimilarity], result of:",
          "details": [
            {
              "value": 666.6666,
              "description": "score(, doc=58400), computed from:",
              "details": [
                {
                  "value": 666.6666,
                  "description": "query boost",
                  "details": []
                }
              ]
            }
          ]
        }
      ]
    }
2

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