mUltimate Chopin

Op. 28 No. 21, Prelude in B♭ major

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b. 33

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

..

A originally had F as the first quaver.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Deletions in A , Accompaniment changes , Bass register changes

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. 37-38

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

Slur from a1 in A (→FC,FE→EE)

Slur from a2 in GE
..

The slur of GE is manifestly erroneous, perhaps due to association with the slur in b. 35-36.

category imprint: Differences between sources

issues: Inaccuracies in GE

b. 37-38

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

No fingering in A (→FE,FC→GE)

Fingering in EE
..

category imprint: Differences between sources

issues: EE revisions

b. 38

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

Accent in A (→FE,FC→GE)

No mark in EE
..

The omission of the accent is undoubtedly an oversight by the engraver of EE.

category imprint: Differences between sources

issues: Errors in EE