Why the Flow failed, but there is still a Task running?

Hi :slight_smile:

So we have this flow in a failed state, but there is still one task running:

Since there the Flow is in a failed state, the only place where you might locate this rouge task is via the Task Run Concurrency screen:

This is hurting us since this task takes up a concurrency slot.

So the question is what might have led to this situation, and is there a way to make it so that when a flow fails, all its tasks are guaranteed to stop as well?