The difference is that the task status (as shown in the activity window/process monitoring) is different than the task status within the parent which is shown in the Workflow Monitor.
The graphical Workflow Monitor and list view of the Workflow Monitor shows the same status within the parent and is consistent. From the Java User Interface (UI) it behaves the same way.
The Activity Window shows the task status and the Workflow Monitor (graphical) shows the status within the parent.
The Workflow Monitor in list views does not exist in the Java UI.
Therefore, from a consistency perspective, this is the designed behavior for version 12.
Fix Status: No Fix