Hard to know if they'll ever get it to work for a 1040SR.
BUT, as I already noted...don't bother since almost nothing transfers. You could have manually entered your names, SSN's, mailing address, telephone number.....the few things that would-have transferred, in 5-10 minutes. And the 2020 AGI you don't need until you actually file, and that's on line 11 of your 2020 form 1040SR.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
