I have the following setup:

1) job 'build' which starts jobs 'productbuild' and 'testbuild'
2) job 'build' starts job 'testrun' using join
3) job 'build' promotes to 'build-succeeded' when both 'productbuild' and 'testbuild' are successfully build
4) jobs 'productbuild' and 'testbuild' promote to 'build-succeeded' when upstream promotion 'build-succeeded is triggered.

Step 4) doesn't get triggered even though job 'build' promotes correctly in step 3.
Fingerprinting has been setup, and seems to work ok for promotions in the other direction (when downsteam job completes, the upstream jobs do get promoted).