In both bars AI features a1 as the 5th semiquaver (the note is written only in bar 31, as bar 32 is briefly marked as repetition of the previous one). This pianistically and sonically awkward version is certainly a mistake, which is revealed by the compatible version of the remaining sources, as well as the comparison with analogous bars 35-36.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Terzverschreibung error, Errors in the number of ledger lines
notation: Pitch