Issues : Errors of A

b. 21-22

composition: Op. 50 No. 1, Mazurka in G major

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There is no tie of g in A1, which must be Chopin's oversight: cf. b. 17-18. The tie was added in FE (→EE), which, however, does not need to point to Chopin's proofreading, since such additions would be routinely introduced by the publishers, sometimes explicitly contrary to Chopin's intention, e.g. in the Mazurka in D Major, Op. 33 No. 3, b. 8-9 and analog. or in the Scherzo in C Minor, Op. 39, b. 34-35.  

category imprint: Differences between sources

issues: Errors of A , FE revisions

b. 45

composition: Op. 50 No. 1, Mazurka in G major

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In A1 (→FE) there is no  lowering e1 to e1. It is a result of inattention at the time of performing corrections in this autograph: originally, it was a crotchet featuring e1 alongside the necessary  that was on the 1st beat in the R.H. bottom voice. Chopin did not control the notation of accidentals after he had replaced it with a rest. The sign was added in EE; it is also in GE, which could also be explained by an editorial revision.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors resulting from corrections , GE revisions , Errors of A , Errors repeated in FE