On 2/1/2019 I completed a joint MN State return and the Line 4 Deduction was the correct Standard amount $24,400. When I went to file on 2/11/2019 it changed Line 4 to an amount $4,793 LESS than the Standard Deduction and increased my Tax. It should only choose to itemize if the deductions are more than the standard.
Is it possible that you earned more than in a prior year and the deduction is being partially phased out?
In Minnesota, the standard deduction begins to phase out as income exceeds $194,650 ($97,325 if you are married and filing a separate return).
Source: See Page 3 of this PDF for details on the standard deduction phase out
Thanks for the tip @AlexanderS08 ! I only looked at Schedule M1SA for MN Itemized Deductions, which also references the limit. However, I needed to look at MN State Form M1 Line Instructions that includes a Worksheet for Line 4 - Standard Deduction LIMITATION. This explains why TurboTax didn't include MN Schedule M1SA and what is NOW the correct Deduction amount. I will mark this resolved. I still don't know why it wasn't correct the first time with the limitation applied to my Deduction upon 2/1/20 preparation. It would have been nice to be informed the state return was not complete / ready for filing or notified of the change to my In- Process return.