I have 4 jobs of which three are the "multi configuration style". Project A is a free-style job with the following configuration:

Post Build Actions -> Build Other Projects -> ProjectB, Project C
Join Trigger -> Project D
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Project B and C are multi-configuration jobs that each build two configurations (axis); one on a mac and one on a windows slave.

Project D is a multi-configuration job that builds on mac and windows slaves as well but it first copies artifacts from projects B & C.

When I build Project A it starts projects B & C but then it immediately completes. I'm expecting it to start Project D after projects B and C successfully finish. It takes 15ms and this is it's output:

Started by user foobar
Building on master
Project A still waiting for 2 builds to complete
Triggering a new build of Project B #13
Triggering a new build of Project C #32
Notifying upstream projects of job completion
Finished: SUCCESS