Don't know the answer to your transfer question. But have observed that the bug inserts itself when you do the review return, switching the $600 federal deduction to $300. (Which as far as I can tell, WAS the MFJ limit in 2020, AND it was above not below the AGI.) By going into forms mode and making it $600 again, we got all the way to ready to e-file, pending one more review. The top-of-screen numbers still reflect $600 -- also the state (CO) return shows the excess donations deduction correctly. So now we're just hoping the software doesn't silently change that number back when we actually e-file.
So this workaround, if successful, should allow us to itemize our deductions, get the $600 federal + 500-excess state deductions, without having to abandon TurboTax (this year).
