It's a good question. I would not just change the sale from short to long term. Even though the IRS doesn't have the cost basis they do have the amount of sale proceeds and whether or not it was short or long term. So if you change it they're going to want to know why.
You should first contact your broker. Whoever handled the trade for you needs to know that they have the acquisition and vesting dates wrong or they need to explain to you what dates they used in order to set the holding period so that you understand why it is entered the way that it is.
Either way, looks like you should get an extension.
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