Fuzziness match query issue

I have "region" field of text type with standard analyzer. Here is my "should" query:

"bool": {
  "minimum_should_match": 1,
  "should": [
      "match": {
        "region": {
          "query": "Київ",
          "fuzziness": 4

Here is the query prepeared from Search Profiler:

((region:киев)^0.75 region:київ (region:м.київ)^0.5)

And I've got all variations of "Київ" but why not with "Київська" which are exist in my index ? I've tried to use more fuzziness up to 20+ but it doesn't help.

Additionally query by string "Київсь" matched "Київська"

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