not to worry - there is a 'settle up' section for the stimulus as part of the 2020 tax return. Just answer the questions at the END of the interview process. the additional stimulus you are eligible for will end up on Line 30 of Form 1040. The 2nd stimulus is not programmed in yet, but it's expected to be (we hope!) by the time the filing window opens in late January. Suggest not filing until you are confident the software has been updated
does that help?