@DawnC So I revisited this and you were on the right track. After Continuing with Itemized Deductions selected a screen titled Charitable Cash Contributions under Cares Act comes up. It tells about the $300 charitable deduction when using the standard deduction. The bug is that this screen should never have been presented. On this screen is a line: Cash Charitable Contributions made in 2020. The amount from Schedule A line 14 is already filled in. If you set this to 0 then the 1040-SR line 10b also becomes 0 and the Schedule A line 14 remains unchanged. So a valid work around. But be careful, if you go back through this sequence again the 0 will have been replaced again by the Schedule A value.
