It depends. if you you know how much FICA taxes was withheld in 2020, you can fill out the 4852 for 2020. Just remember, when you amend your return to file the 4852, delete the other W2 so that only one form will a in the return. Make sure you have a copy of your original W2 so you can enter that information on the 4852 along with the FICA information.
As far as any adjustments, there may or may not be a penalty. Just make sure you delete the original W2 because you are updating iwth the 4852. You don't want both tax forms in your return when you amend it.
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