reproduce steps:
0. config jobA and jobB, jobB is downstream of jobA; and jobA were configured with promotion condition "When the following downstream projects build successfully".
1. trigger two builds(build 1 and 2) of "jobA" in short time;
2. the downstream job "jobB" scheduled one build for the two upstream builds(jobA build 1 and 2), and the build finished sucessfully

Unexpected result:

Trying to promote the build 2 of jobA, the condition of the downstream projects build successfully was not satisfied.