There is a software bug in the Turbotax 2023 Deluxe desktop version. A simple test can show the case as below:
I talked to Turbotax support (case# xxxxxxxx) and hopefully they could fix it before the Tax day.
It also depends on your answers to the follow up questions after entering the 1099R.
AFTER ALMOST ONE MONTH, Turbotax still did not fix this simple bug?
Any follow-up question should NOT make the data field "1040 box4b" (taxable amount ) link to 1099R box1(Gross distribution). It should always links to 1099R box2a(taxable amount). And for Turbotax developer, this fix on links is a easy job and should not take so long to do so.