The instructions for Form 1099-B say very clearly that the date sold in box 1c is the date that the trade occurred, or that the cash was constructively received.
Is the 1099-B form for 2017 or 2019?
If it is a 2019 1099-B form, the date in box 1c, should be the date that the money was constructively by you, not the date back in 2017 that the original sale occurred.
The easy workaround is to simply change the sale date to the date that you received this money in 2019, assuming this is a 2019 1099-B form.
If it is a 2017 1099-B form, you need to amend your 2017 tax return to add the amount.
As far as this being a TurboTax problem, all tax software I have ever used only allows you to report current year sales.
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