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Already in As, Chopin wrote two versions of accompaniment in these bars and in bar 24, however, it is not clear how he planned to use them. Eventually, in all later sources they were used to diversify the repeating figures through differentiation of the part of the L.H. in bars 21-24 and 29-32. The presentation autographs and the published version differ, however, in the order of appearance of both versions – apart from minor details, AI, AII and AIII first include the "tenor" version, which in A (→FE→GE,EE) appears only as the second.
In order to preserve the continuity of the bass line after a possible version change, in the context of this note, one has to choose one of the corresponding variants in bars bar 20 and bar 24.
In the main text we add a cautionary 
before e
1 in bar 21, after the authentic sign before g1 in bar 23.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Chopin's hesitations, Accompaniment changes
notation: Pitch