in 
On the last quaver of bars 40 and 56, both f
2 in As and f
2 in AI are written in a way that does not raise any doubts. It proves that while working on the Waltz, Chopin certainly considered two versions of this note. In this situation, leaving it in A (→FE) without an accidental does not allow interpreting Chopin's intention with an absolute certainty. In the main text, we assume an interpretation compatible with the valid norm, however, we specify the sound with a cautionary 
.
The version of EEC is certainly erroneous.
category imprint: Differences between sources; Editorial revisions; Corrections & alterations
issues: Accidentals in different octaves, Chopin's hesitations, Main-line changes
notation: Pitch