Setting Flagging field with loop transition sets days in column to incorrect value

After setting the flagging field to a non-empty value, the "days in column" on the card is set to 15736. This occurs when using a global loop transition to set this field via a "flagging" screen (doesn't matter if the transition takes place in the kanban view or the issue list/detail page).

Issue is self-resolved after changing the status of the card in question.

Steps to reproduce:
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• Create a workflow
• Add a couple of steps
• Add a transition for one step with the same step as destination (loop transition) - doesn't need to do anything else for the purpose of reproducing the bug
• Assign a project to use the workflow
• Create a Kanban board for the workflow
• Create some issues and then use the loop transition on them
• Hover over the dots at the bottom of the issue in Work mode until the tooltip appears and it says 15000+ days (I didn't get quite the same value but it was definitely around that)

(alternatively, use the simple workflow (sw) project in the GreenHopper sample data)