Issue Summary

Some issues are not displayed on a Kanban Board even though they are displayed in the filter that is being used in the board when viewed directly in the Issue Navigator.

Steps to Reproduce

1. Navigate to the General Configuration of the Kanban board (Agile > "Your Kanban Board" > Board > Configure > General).
2. Verify if the Kanban board sub-filter is being used.
3. Append the sub-filter to the Filter Query in the Issue Navigator and verify if the issue is still displayed.
4. It is no longer displayed.

Expected Results

JIRA Software Kanban board should show all Issues

Actual Results

By default all Kanban boards have the following sub-filter, which will prevent any issues without a Fix Version field to be hidden from the board:
fixVersion in unreleasedVersions() OR fixVersion is EMPTY

This happens because any fields that are hidden as per Hiding or showing a field in a issue type are not considered for search results, and in this example the fixVersion is not empty nor unreleased as it doesn't exist for this project/issue type.

Workaround

https://confluence.atlassian.com/jirakb/jira-software-kanban-board-does-not-show-all-issues-779158700.html