Given a hierarchical workflow with a mix of PMC and non PMC workflows. PMC specific queries can get executed on non PMC workflows.

Job with Tasks A, B, C where Task C passes only on the third retry.

Non PMC -

Job Instance | Task | Exit Code

1 | A | 0
1 | B | 0
1 | C | 1

2 | A | 0
2 | B | 0
2 | C | 3

3 | A | 0
3 | B | 0
3 | C | 0

Task Success, Task Failure = 3, 0

But if a PMC query is applied here Task Success = 7

Also, if task succeeds but the task post script fails the task success will be counted when a PMC query is applied in a non PMC job.

Partial Fix - Instead of count(invocation.exitcode) use count(distinct invocation.abs_task_id)