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b. 148

composition: Op. 35, Sonata in B♭ minor, Mvt I

d2-g2 in GC, FE (→EE) & GE2

b1-g2 in GE1

..

The version of GE1 is certainly a mistake of the engraver, corrected in GE2. The bottom note of this dyad is devoid of natural in GC, FE and GE1, which in all of the cases is a patent error.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in GE , Terzverschreibung error , GE revisions

b. 149-150

composition: Op. 35, Sonata in B♭ minor, Mvt I

..

Similarly as in the previous bars, GC and FE1 (→FE2FE3) lack seven accidentals before the notes which were previously already correctly written in another octave. These patent inaccuracies do not impede the interpretation and they were completed in the subsequent sources to a varied extent (including FED, in which a  before the top note of the 3rd crotchet in bar 150 was added). It is only EE2 that has the fully correct text.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Annotations in FED , Accidentals in different octaves , Inaccuracies in FE , GE revisions , FE revisions , Inaccuracies in GC

b. 149

composition: Op. 35, Sonata in B♭ minor, Mvt I

Slur in GC, FE (→EE) &GE2

No slur in GE1

..

The missing slur in GE1 is surely an engraver's mistake, corrected in GE2.

category imprint: Differences between sources

issues: Errors in GE , GE revisions

b. 149

composition: Op. 35, Sonata in B♭ minor, Mvt I

..

In GE1, almost certainly due to the engraver's inattention, the pedal release marking was omitted. The mistake was corrected in GE2.

category imprint: Differences between sources

issues: Errors in GE , GE revisions , No pedal release mark

b. 151-152

composition: Op. 35, Sonata in B♭ minor, Mvt I

g2 & g1 in GC (→GE) & FE (→EE1)

g2 & g1 in EE2

g2 & g1 suggested by the editors

..

The naturals raising g2 to g2 and g1 to g1 are certainly an arbitrary addition of the reviser of EE2, who perhaps considered the natural character of the piano grip, since in terms of style, there is no reason to assume here an oversight of the naturals by Chopin.
In the main text we add a cautionary  before g2 in bar 151.

category imprint: Differences between sources

issues: EE revisions