The diagnostic is wrong, do not use quick fix.
From the new update
Cumulative balance of unused losses calculated from AFR data
Three new columns to the right of the capital gains and losses table calculate the cumulative balance of unused losses based on data downloaded from Auto-fill my return (AFR). The related review message now includes a Quick Fix to enter the calculated balance into the various periods across row A on the Net Capital Loss worksheet. The calculated spread applies oldest losses first.
Diagnostic from AFR data
It properly calculates the cumulative balance of $809; however, it wants to include a balance before May23, 1985 of 268.67;
Which appears to be the difference between 809.00 and 539.33.
If you accept the AFR suggestion,you get the following
That being said, I do like the idea of calculating the balances since the CRA data gives be a head ache every time I do the calculation.