Hello Robert,
I have experienced the same problem (that Form 8938 is not saved, and cannot be found when I log in again later).
I am not sure that the short term workaround you suggested is acceptable to the IRS, since there is no way to prove that the efiled return included the duly completed Form 8938 and avoid paying the harsh penalty for failing to report foreign financial assets.
This same problem (of Form 8938 not being saved in the Online version of TT) was reported by several users in 2020 and 2021. Would you know why TT has not corrected this issue, i.e. why TT cannot save this particular form?
