I reported this problem in 2017 with regard to 2016 TurboTax and it was never addressed. For some inexplicable reason, if no Form 8606 Part I is required to be filed, TurboTax reduces your carryforward basis to your basis minus your QCD or the year-end value that you have entered for your traditional IRAs. In 2017 I submitted test file Token 378590 demonstrating the QCD/basis problem.
In the absence of a Form 8606 needing to be filed, a workaround might be to enter a traditional IRA value that is more than your basis whether or not you enter your traditional IRA year-end value. In this case, this would need to be done in your 2021 tax file before transferring in to start your 2022 tax return.
Even worse, if you have a similar situation but the distribution is instead an HSA Funding Distribution, TurboTax loses ALL of your basis. In 2017 I submitted test file Token 378589 demonstrating the HFD/basis problem.
It's clear that TurboTax Product Qualify has chosen to ignore these problems.
It might be that all you need to do is correct the basis directly on TurboTax's IRA Information Worksheet (accessible only in the CD/download version of TurboTax).
