In the entire G
major section of Variation V (bars 263-268), the pedalling markings are written in A rather carefully; however, it can be seen that more attention was paid to keeping the marks on the same level than to their correct alignment. In particular, the 
marks in bar 265 are written before the bass D notes, as a result of which the preceding 
marks had to be written sufficiently earlier. It did not lead to a significant inaccuracy at the end of bar 264; however, on the 2nd beat of bar 265, the mark actually falls before the d-a-c1 quaver. Such an early pedal release could not have been intended by Chopin, since the and marks are written next to each other and almost certainly simply indicate a pedal change.
The notation of the editions is similar to the notation of A; however, it is less confusing due to different proportions of gaps between the notes and due to the size of the marks.
FESB overlooked the sign on the 2nd beat.
Compare the passage in the sources»
category imprint: Graphic ambiguousness; Differences between sources; Source & stylistic information
issues: Inaccuracies in A, Errors in FESB
notation: Pedalling