Test Plan List gadget showing Epics

Description
Test Plan List gadget is showing Epics if use a below JQL 

((issuetype in (Bug, Story, Task, "Test Plan") and "Epic Link" in (MZNB-18)) OR (issuetype in (Sub-task) and parentEpic in (MZNB-18))) or key in (MZNB-18) ORDER BY type, summary 

Pre-conditions

How to reproduce

1. Writ the above JQL query
2. Save the filter
3. Use the filter on Test Plan List Gadget
4. Gadget will show Epic on the results

Actual result/Attachments

Test Plan List Gadget showing Epic on the results.

Expected result

The test Plan List gadget should only show the Test Plans.

Version

• <app versions>