Chopin frequently changed details of his compositions up to the very last moment. So much is clear not only from contemporary sources, but also from variants between original editions and manuscripts. Such variants, moreover, cannot possibly be considered to be engravers errors or editorial alterations.
Do you have a link to the Ashkenazy performance? If he plays the phrase in bar 13 in a different rythm then the opening messaures with a acciaccatura on the high F# he's playing the Oxford version. The Fonata version has an even rhythm of 8notes/ quaver in each phrase of the A section.
So, as I said before, I would go for the Paderewski. Though I can't see if this volume contains both versions and I can't see which one it contains, it seems that it contains only one version, as far as I see from the table of contents. I have a Paderewski edition which contains both versions