The vertical line visible in A under the c1 note on the 2nd beat looks like an additional crotchet stem. It is possible that it indicates that the note should be extended here, but it would be difficult to justify why the respective notes in analogous figures are not extended. Therefore, the alleged crotchet stem is almost certainly an insignificant pen stroke, which would often happen to Chopin at the time of writing notes on ledger lines above the stave (most often c1) – see, e.g. the Mazurka in B
minor, Op. 24 No. 4, bar 23.
The additional crotchet in EE2 was added after GE1.
Compare the passage in the sources»
category imprint: Differences between sources
issues: EE revisions, Uncertain notes on ledger lines
notation: Rhythm