mUltimate Chopin

Op. 28 No. 21, Prelude in B♭ major

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Pedalling

b. 12-13

composition: Op. 28 No. 21, Prelude in B♭ major

   in A (→FC→GE)

No markings in FE (→EE)
..

The pedalling markings, deviating from the scheme of the previous bars, were intended by Chopin, which is evidenced by the mark at the end of b. 12 having been crossed out. However, it cannot be ruled out that the uncommon placement of the markings could have been the reason they were overlooked by the engraver of FE, who, having his doubts to the correctness of the notation of A, preferred to avoid a possible mistake.

category imprint: Differences between sources

issues: Errors in FE

b. 36

composition: Op. 28 No. 21, Prelude in B♭ major

in sources

 suggested by the editors
..

The  asterisk under the last quaver in the bar is probably Chopin's mistake. In the next bar a  mark, entered into A also under the last quaver, was later crossed out and put under the 3rd quaver, as it is in all the remaining bars of this progression (b. 33-35 and 38).
According to us, Chopin probably wanted to introduce longer pedals for them to correspond with the advancing crescendo; however, he eventually gave up this idea and left the mark in the discussed bar by inadvertence. 

category imprint: Interpretations within context; Editorial revisions

issues: Omitted correction of an analogous place

b. 57

composition: Op. 28 No. 21, Prelude in B♭ major

  in A (→FC→GE)

No markings in FE (→EE)
..

The absence of pedal markings is an oversight by the engraver of FE (→EE).

category imprint: Differences between sources

issues: Errors in FE