We start a job which has 5-6 downstream jobs using the parameterized plugin( the parent job is blocked on downstream jobs). Every now and then the parent job keep waiting for the downstream job result even though the downstream job has finished successfully.

Example Scenario Project A started B,C & D and is waiting for it to finish
Project A1,A2....A10 also triggers B,C,D and is waiting for it to finish.
One of the Projects say A5 will be waiting forever for say a project C#10 which has already finished.