In A (→GE1→FE→EE1→EE2) there is neither a 
returning a
2 in bar 107 nor a cautionary before e3 in bar 108. In GE2 only the first was added and in EE3 – only the second.
In analogous bars 105-106, Chopin wrote in A both signs, which suggests that at the time of writing a repeating phrase, the composer's concentration broke (cf. bar 107). It increases the likelihood of oversights of ties at the end of bar 108.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Omissions to cancel alteration, GE revisions, Cautionary accidentals, Errors of A, Errors repeated in GE, Errors repeated in FE, Errors repeated in EE
notation: Pitch