Operator 'is not' does not support searching for non-empty values for field 'issuetype'.
Seems like a basic search that should be allowed.
Try "not in" instead. As in "issuetype not in (bug, feature)"
The operator 'is not' is used only to validate whether it is EMPTY or not. The issue type value can never be empty in JIRA issues. You are looking to check the issue type value and hence please use != operator.
For example, issuetype != epic
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