Because there is not a second quarter in 2020, form 2210 should carry the overpayment from quarter 1 to quarter 3. I.e., line 18 column B should be 0 instead of blank. Then the overpayment from column (a) line 26 will correctly carryover to column (c) line 20.
While I can override line 18 column B in order to get the correct calculation, then the return is not eligible for e-filing.