It might be confusing that how many issues there are actually on a Kanban board with Epic swimlane

Summary

It might be confusing that how many issues there are actually on a Active Sprint page with Epic swimlane.

Steps to Reproduce

1. Create a Kanban board on a project
2. Create an Epic and a Task (any issuetype is ok)
3. Set Epic swimlane on the board

Actual Results

The Kanban board shows there are two Backlogs but there is only one issue card.
(It must be an intended feature but it might be confusing.)

Expected Results

The board should show the information more understandable.

Notes

Especially, if the following filter is set on the board and 'Epic' issuetype is excluded from the board, it could be more confusing.

PROJECT = <project name> AND ISSUETYPE in (Task) ORDER BY Rank ASC

Then, even though it shows that there are one backlog, there is no card on the board as follows.