Exact same issue. Did the same, and same conclusion: the SW doesn't keep any information entered (I did it a a few times), and obviously the form 8938 has not been attached to my return when I filed.
Extremely frustrating, especially considering that I filed this form for the past few years with Turbotax and never had any issues.
Turbotax, please fix this and let us know the step-by-step to properly refile this form. Txs
