The lookback of 0 is not being honored.
This problem is solved in CA WAAE 11.3.6 INCREMENTAL1
08. JOB DOES NOT HONOR LOOKBACK '0'
When you define a job with a look-back dependency of 0 (zero), the
scheduler examines the last end time of the condition job and if
the condition job has not run since the last run of the job for
which the condition is set for, the job should not run. However,
the scheduler ignored the look-back dependency of 0 and scheduled
the job as if the look-back dependency is not defined when the
condition job and scheduled job went into terminal status
(such as SUCCESS or FAILURE) in same second.
Please download WAAE 11.3.6 Incremental 1