But now when I collapse the filter-pane the results go away and the text is not searchable. The filter pane works when making a selection but collapsing the list to show just the title "Top 5 reason" makes the whole list go away.
In the attached file I will try to simulate your situation. As you can see from the attached file, before the selection starts, the entire list of ranked values is displayed in the corresponding field. Your situation is observed only if you enter values in the search string that are not in the list, which is correct.
Maybe my example is different from your situation?