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> "Block on upstream jobs" only prevents conflicts of RUNNING jobs, a task in the queue does not prevent D from starting.
I'm not quite sure I know what you mean. "Block on upstream jobs" will certainly prevent a job from running if its upstream is in the queue.
Create jobs A, B, C, where C is upstream to B. Have a single executor, and start A, B, and C. Even though B was queued before C, it will run after C, because the fact that C is queued prevents B from running.
> Jenkins schedules a build of D because nothing says it cannot.
"Block on upstream builds" says it cannot, as D's upstream C is still in the queue.
"When this option is checked, Jenkins will prevent the project from building when a dependency of this project is in the queue, or building. The dependencies include the direct as well as the transitive dependencies."