Yes, it would be best to wait to send you the amended 2021 return until the first 2021 amended return has been processed. But you can go ahead and submit the 2020 amended return.
To verify, did you have the 6% penalty calculated on your 2019 return? If yes then you will have to amend the 2019 return as well.
In regards, to the lost started 2021 amended return you might have to contact TurboTax support. Please see What is the TurboTax phone number?
Another option is to download Form 1040-X and fill it out manually. The change on Form 5329 and Schedule 2 line 8 will affect line 10 on Form 1040-X. And then you can fill out the rest to calculate your refund.
@dpreas2017
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