TurboTax does prevent e-filing when you indicate that you have a Form 3520 (even though the unsupported form would not go with the tax return).
Form 8938 provides an option to let the IRS know that you have reported certain assets on Form 3520 so that you do not have to duplicate your efforts on Form 8938, so it's an important indicator.
If you prefer to e-file your return, my recommendation would be to list the account(s) that are on the 3520 again on the 8938 since you can't e-file with an indicator that the IRS should look to the other form for the data.
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