Leaving a lone 
mark in bar 51 in FE (→EE1) seems to be a mistake. However, it cannot be exluded that it was Chopin himself who made the mistake, as the incomplete pedal marks were already in [A1]. The pedalling of EE2 was most probably taken from GE and the fact of moving the changes of pedal to the end of bars 53 and 54 was probably motivated by graphic issues and was not meant to indicate an earlier change of pedal.
Compare the passage in the sources »
category imprint: Differences between sources
issues: EE revisions, Errors in FE
notation: Pedalling