A Job-A is triggered by Job-B. This is configured via "Build after other projects are built" configuration in JobA.
In terms of behaviour, everything is fine : Job-A is correctly triggered after a build of Job-B.

But in Job-B configuration, the "Build other projects" in Post-build Actions section isn't configured. This section should be filled with a Job-A trigger but it's empty.

The inverse is also true : if a Job-D is triggered by a Job-C via "Build other projects" in Post-build Actions section of Job-C, Job-D "Build after other projects are built" section is empty.

Note : https://groups.google.com/forum/#!topic/jenkinsci-users/MEjz9N38bus