charitable contributions has an unacceptable value

Product: Turbotax desktop; Filling status: Married filing jointly

Worksheet 1040-SR line 12b: I donated more than USD 600 and the correct donation amount (>600) is shown on line 12a. On line 12b, Turbotax enters 300, which is wrong. It needs to be 600 for married filing jointly. Therefore, an error appears that line 12b (300) has an unacceptable value. The error goes away when I enter 600, which is the correct value for married filing jointly.

 

PROBLEM: When I run the final error check before filing, Turbotax again enters 300 into line 1040SR line 12b and throws me into an infinite loop. Therefore the online solution to the error described above does not work, the error appears again when running the error check. Is there a known workaround?

 

Since this seems to be a known problem, will this be fixed (and when) or should I ask for my money back and file a handwritten paper return instead because Turbotax cannot fix this error? Thanks!