Thanks to the crossings-out and added notes in b. 2 and 6 visible in A, we can reconstruct the initial version of the last beat of these bars as 
and 
. The idea of changing it probably arose when Chopin was writing b. 6; afterwards, he introduced a respective correction in b. 2. It is proven by the notation of an analogous figure in b. 10, in which the final version was written right away, without corrections.
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category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Deletions in A, Main-line changes
notation: Pitch