I've recently been finding that my kanban board shows several extra assignees in the quick-select section. Clicking on them does not show any tickets on the board. After investigation into the board query and sub-query filters, I've discovered that these mysterious ticket owners are actually the owners of the parent tickets showing on the board, despite the queries intentionally not pulling in those tickets.
So if Jill is assigned a parent ticket, and Jack is assigned the subtask, and the board's query is for only tickets assigned to Jack, there will still be an icon for Jill on the board, even though no ticket she is assigned will ever appear on that board (because the filter is only for tickets assigned to Jack). Multiple that for several teams and you have a lot of extra clutter for tickets that will never show on your board.
Is anyone else having this issue? Is there already a ticket for it?