Google Batch - Stub Run not working

I have a workflow that runs in Azure Batch as expected. I ran the same code (same Commit Id) through Google Batch and the pipeline did not run the same way. I tried re-lauching the same pipeline with the option “Stub Run” to see if it is my workflow code or my process tasks. The execution log indicates the process tasks ran…not dummy tasks as described. Am I missing something ?