Unfortunately, the amount of data is a bit too low to draw conclusion, but if one look at the data for each fly:

Only one fly not learning and the median would be 0. It looks very similar in the d42xPKCi cross, suggesting that the flies will also show the phenotype.

This will need to be confirmed next year with a new cross.
Other data visible at https://figshare.com/preview/_preview/104549
and later at doi: 10.6084/m9.figshare.104549