After you file
The issue is that the recovery rebate credit is not being applied to box 15 of form 1040X as a refundable credit (other box checked with RRC listed) when filing through TurboTax. However, it is still listing the updated refund amount on the generated 1040 form when reviewing files to send on amended returns.
I have attached a picture of the 1040X form below. This took a five minute google search and the information comes directly from the IRS released on 03/01/2021.
