Why do I have work items in 'None +1' sprint?

[Ben Mathews]

When I use 'Search for Items' and add the sprint column, may items are shown as being in sprint 'None +1'.  What in the Heisensprint!  Surely it's either in no sprints, or in 1 sprint?

As far as I can tell, this happens when the sprint an item was completed in is closed but for some reason it doesn't want to show the sprint name in the list.

This is doubly frustrating as I was trying to use this view to view work items in completed sprints so I can tag them with releases as I haven't found another way to view closed sprints but that's probably best kept for a separate question!

[Trudy Claspill]

Hello @Ben Mathews 

The Sprint field is not a single value field. It shows all Sprints that the issue has every been in where it was in the sprint at the time the sprint was completed.

The "None" is an indication that it is not currently in a planned or active sprint.

The +1 is an indication of it having been in a previous sprint that has been completed.

If you hover your pointer of the +1 it will show you the completed sprint(s).