The output of pegasus-statistics shows this:

Type Succeeded Failed Unsubmitted Total Retries Total Run (Retries Included)
Tasks 210672 0 0 210672 || 0 210672
Jobs 2354 0 0 2354 || 100 2454
Sub Workflows 16 0 27 43 || 0 16

But I know all 27 "unsubmitted" sub-workflows have, in fact, been submitted.

There should be another state that is either "running" or "incomplete" or "submitted" or "unknown" or something.