Single 
marks appear in Chopin's pieces quite rarely and – apart from the pieces' endings – most often result from oversights of 
marks supposed to complete them. According to us, this is also the case here – starting from the mark at the beginning of this bar, there are no more pedal marks in A until the end of the line of text (in bar 311), which points to momentary distraction. Due to the above, in the main text we suggest adding a , in accordance with the harmonic sense. Such a mark was also added in EE, almost in the same place.
Compare the passage in the sources»
category imprint: Differences between sources; Editorial revisions
issues: EE revisions, No pedal release mark, Inaccuracies in A
notation: Pedalling