When a workflow has jobs which produce no output files, and the workflow is run in condorio mode (and possibly nonsharedfs), the resulting submit file makes HTCondor stage all files created in the remote directory back to the submit host. This is wrong as the workflow states that no outputs should be considered.
I have attached an example workflow which works on obelix.
There are multiple discussions about this on the HTCondor mailing lists and bug tracker. The first link presents a potential solution, but we need some logic on when it should be added to the submit file.