Hi. I just had the same thing happen with my schedule E for rental properties. Not sure if the K-1 schedule has the same section, but I pulled up my 2020 return and reviewed the carryover to 2020 section (which is the 2019 amount) on the schedule E worksheet (in forms view) and manually entered this qbi amount in the box on 2021 when it came up as an error to fix. Ran the review again and it went through. Hope this helps.
