When running several multijob build in parallel (for the same mtijob) it sometimes sets some of them as 'suceeded' without getting any result from downstream jobs, where is an example of the console output, I'll try to track down and I'll post everything I find out (if any):

Started by user anonymous
[EnvInject] - Loading node environment variables.
Building on master in workspace /var/lib/jenkins/workspace/popopo@3
Run condition [Always] enabling prebuild for step [MultiJob Phase]
Starting build job timeout_X.
Starting build job timeout_20.
Run condition [Always] enabling perform for step [MultiJob Phase]
Notifying upstream projects of job completion
Finished: SUCCESS

As you can see, there's no return from the started builds.