I spoke to TurboTax support as I was having the same problem this year and they said that it was a known bug that they were working on.
However, what worked for me this year was this:
I went into Form 8938 through the same ‘Other Tax Situations’ route that I described in my post above, however as soon as I filled it out I immediately went to the end of the interview and previewed and saved the filing as a PDF. If you do this right away after filling out Form 8938 it will be there, however if you go back to income or deductions it disappears and you have to start over again!
Note that you can only preview the return if you have already paid.
Then, I finished my return over the the next few days. I printed out the final return, as well as the one I had saved earlier that included the Form 8938, inserted the printed Form 8938 into my final return and then signed and mailed it.
Hopefully this will save some people some time as filing in the forms over and over again is not a good use of time.
