The correct notation of the trill in the 1st half of this bar and all its repetitions – bars 28, 74 and 82 – appeared in the sources (not including pupil's copies) only several years after the publication of the Sonata, in EE2 and GE2. The mistake was committed by Chopin, who in [A] (→GC→GE1→GE2mar,→FE1→FE2→EE2) wrote the trill minim as a G
(with a cautionary 
). The error was noticed in the proofreading of FE3 (→FE4,FE5), however, at the time of performing the correction, another mistake was committed, by moving the note mechanically together with the preceding it flat, which resulted in an F. The correct text was marked in all pupil's copies.
A similar mistake, consisting in writing the top second of the main note of the trill instead of the main one, from which the trill starts in this context, is to be find also in, e.g., the Bolero in A minor, Op. 19, bar 187.
In EE there is also no wavy line after the trill.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources; Corrections & alterations
issues: Annotations in teaching copies, EE revisions, Errors in FE, Annotations in FED, Errors in EE, Errors resulting from corrections, Errors in GE, GE revisions, EE inaccuracies, Errors of A, Annotations in FES, Authentic corrections of FE, Errors of GC
notation: Pitch