Epic Names Disappearing Temporarily After Moving Ticket from Top or Bottom of That Particular Swimlane

When attempting to move a ticket with an Epic associated with it, to the top or bottom of a swimlane, all Epic associations in that swimlane disappear temporarily. These look to eventually show, after a refresh of the browser, or after a few minutes of waiting, and then clicking on the ticket, again. (Note that, this does not remove the Epics from the ticket, it just does not show them on the Board.)

To Recreate:
1. Place several tickets associated with an epic in a column on the Board.
2. Right click on one of these tickets, and select Send to "Top of Swimlane" or "Bottom of Swimlane".
3. Observe.

Expected: Ticket should move, but Epics associated with that ticket and any other ticket within that Swimlane will still show after moving.

Actual: Ticket moves, all Epics in that swimlane disappear, until refresh.