Yes, it's a bug and they should fix it. The only workaround is to find the number for the 2019 QBI Passive Op Loss in your 2019 return and enter it manually. It's on the same form in Schedule E, so go to the Forms View and search. It's not hard to find, but that just makes it more annoying to have to find it yourself.
If your 2019 Total Loss was not limited (usually the case), then the 2019 QBI Passive Op Loss is the same as the 2019 Total Loss (which, strangely, TurboTax does provide for the 2020 return). If you just want to get around the error message, you can just enter that number in (it's for carrying past losses forward and will not affect the tax you pay until you deplete the loss against profits). If the loss was limited in 2019, the IRS will change the number and ask if you agree. Thank them for finding the error and blame it on TurboTax.
