Issue Summary

Using "IN" with multiple options or the same field with different criteria on the board filter causes the inline board issue Create (Create+) option to disappear

Steps to Reproduce

1. Create a new Kanban board based on a project.
2. Create 1-2 issues just to have something in the board.
3. Confirm you have the Create issue and Edit issues permissions, and that you see the Create+ option in your board when hovering your mouse pointer on the different columns.
4. Modify the board filter to include a criteria with a single option, like "project = <KEY> AND Assignee in (<User>) ORDER BY Rank ASC"
5. Go back tom your board and confirm you still see the Create+ option
6. Modify the board filter once again, this time adding a second user to the search criteria, like "project = <KEY> AND Assignee in (<User1>, <User2>) ORDER BY Rank ASC"
7. Go back to the board

Expected Results

Since the board filter is still simple, the Create+ option is still displayed on the board.

Actual Results

The Create+ option disappears.

Note: the same behavior also occurs if using the same field is included multiple times for different options, even if the query is still considered simple. For example: "project = <KEY> and (assignee = <User1> OR assignee = <User2>) ORDER BY Rank ASC"

Workaround

Use only single options in your board filter and include fields only once in the query.