Select: 
Category
All
Graphic ambiguousness
Interpretations within context
Differences between sources
Editorial revisions
Corrections & alterations
Source & stylistic information
Notation
All
Pitch
Rhythm
Slurs
Articulation, Accents, Hairpins
Verbal indications
Pedalling
Fingering
Ornaments
Shorthand & other
Importance
All
Important
Main


b. 23-24

composition: Op. 28 No. 4, Prelude in E minor

No slur in As, GE2 (→GE3) & CGS

Slur in bar 24 i A

Slur to bar 25 in FC (→GE1) & FE (→EE)

..

The L.H. slur in A encompasses only the two minims in b. 24. The range of the slur in FC is not entirely clear; however, it seems to point at the final E1-E octave, which is how it was reproduced in GE1. A longer slur, probably under the influence of the R.H., is also present in FE (→EE). The absence of the slur in GE2 and CGS is an oversight.

category imprint: Graphic ambiguousness; Differences between sources

issues: Inaccuracies in FE , Errors in GE , Inaccuracies in FC

b. 24-25

composition: Op. 28 No. 4, Prelude in E minor

No slur in As

Slur in remaining sources

..

Chopin added the slur over the final cadence only while preparing the Prelude for publication.

category imprint: Differences between sources

b. 24

composition: Op. 28 No. 4, Prelude in E minor

..

A cautionary  before B occurs in all sources except As. We also add an accidental before the lower note of the octave in the main text.
As has no sharps raising d-d1 to d-d1. It is certainly a sketchy notation and not a variant.

category imprint: Interpretations within context; Differences between sources; Editorial revisions

issues: Cautionary accidentals , Omission of current key accidentals

b. 24

composition: Op. 28 No. 4, Prelude in E minor

Octave B1-B in As

B1-F-B in remaining sources

..

The added F constitutes an improvement introduced possibly while preparing the Prelude for publication.

category imprint: Differences between sources; Corrections & alterations