Save your records that show your sale was long term. Since you chose a Long-Term Code, you probably don't need to Amend your return.
If you had entered the original Code X, TurboTax would have asked more questions to try to make the Long or Short term determination.
The IRS has a copy of your 1099-B, and if they want more information or documentation, you have it.
Here's more info on whether to Amend:
https://ttlc.intuit.com/replies/3318732
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