Export of Membership drops Campaign ID and Campaign Title

Exporting Membership Records no longer exports Campaign. In 4.3 it exported
Campaign ID
Campaign Title

Now the export file has a heading called "Campaign" but it is not populated.
To replicate the problem,
1) Enable the Campaign Component
2) Create a membership record and assign a campaign to it.
3) Export the membership record - select primary fields.
4) Campaign Column will be empty if you have the bug.