Fuzzy search feature not able to search word's end phrase

Fuzzy search able find a part at the beginning but not at the end of a word.
For example:

project=jira and summary ~ estim

Query above are able to return 129 issue ( at the time of creating this report) contain "estimates".
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However if we use query with "mates" instead of "estim":

project=jira and summary ~ mates

It will return 0 result.
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This brings some trouble while searching keyword like PROJECT-UTS124-ANDROID where user only remember keyword of ANDROID.