Exported API reports all jobs twice. It only seem to affect jobs scoped to jenkins.
It works correctly when jenkins is build with java 7 and run on either 7 or 8. Though it is present when build with java 8 (and run on either 7 or 8). This is reproduced by hudson.model.ApiTest.wrappedMultipleItems. Tested on OpenJDK 1.7.0_75 and OpenJDK 1.8.0_31.