Build behavior is inconsistent when re-running failed/incomplete jobs with manual final stages

Summary

Build behavior is inconsistent when re-running failed/incomplete jobs with manual final stages

Steps to Reproduce

1. Create a plan with one normal stage (Stage 1) and one manual final stage (Stage 2).
2. Have at least one job in each stage. This job needs to fail (the reason is not important).
3. Run build.
4. Stage 1 will finish with a failed Job. Manually run Stage 2.
5. Stage 2 will finish with a failed job.
6. Click Run -> Rerun failed/incomplete jobs only.
7. Stage 1 will finish. Its job will fail.

Expected Results

1. The user should be able to rerun the final stage.

Actual Results

Rerunning the final stage is not possible.

Notes

Our documentation states that "A manual stage can only be triggered if the previous stage has completed successfully." (reference). Nevertheless, the bahavior is inconsistent and the user should be able to run the final stage regardless.

Workaround

 Run a new build.