Is anyone else having a problem with their Fed return in the cash Charitable section? Mine keeps saying "Cash Charitable is too large," but I'm entering $300.

I am trying to take the new $300 Cash Charitable deduction that's an option with the Standard Deduction for tax year 2020. My donations were well over $300, so I am entering $300, but it keeps coming up as an error. It doesn't seems to fix it when I change the amount to slightly less either.