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At the beginning of bar 23, my two editions each show a different note in the left hand: in the Verlag, it's E; in Classic Piano Collection ed. John Vallier, pub Cramer Music, it's D.

Here's part of Williard Palmer's explanation of the origins of the pieces usually called Little Preludes or, sometimes, Short Preludes (from J. S. Bach: 18 Short Preludes for the Keyboard (2nd ed.), Alfred Publishing, 1992):

"The Twelve Short Preludes were first collected and published in the middle of the 19th century by F. K. Griepenkerl, who arranged them in ascending order of keys. . . . The Six Short Preludes were first published by Hoffmeister and Kühnel, edited by J. N. Forkey."

These pieces were not composed by Bach as a set. Seven of them are from the Clavier-Büchlein vor Wilhelm Fridemann Bach. The others are apparently preserved only in copies from some of Bach's friends and students. The Alfred/Palmer edition follows the historical publishing precedent by presenting them as a set of twelve followed by a set of six.

The Bach Gesellschaft Ausgabe version on IMSLP shows E (admittedly not the latest scholarship). Palmer's version in the Alfred edition of the Little Preludes claims to be based on a re-examination of the original sources and also shows E. I'm not at the library today to check the Neue Bach Ausgabe. E makes sense to me with the C# in the other voice.

Little Preludes from Clavier-Büchlein for Wilhelm Friedemann Bach (924–932)

* BWV 924 — Prelude in C major
* BWV 924a — Prelude in C major (alternative version of BWV 924)
* BWV 925 — Prelude in D major
* BWV 926 — Prelude in D minor
* BWV 927 — Praeambulum in F major
* BWV 928 — Prelude in F major
* BWV 929 — Prelude in G minor
* BWV 930 — Prelude in G minor
* BWV 931 — Prelude in A minor
* BWV 932 — Prelude in E minor

Six Little Preludes (933–938)

* BWV 933 — Little Prelude in C major
* BWV 934 — Little Prelude in C minor
* BWV 935 — Little Prelude in D minor
* BWV 936 — Little Prelude in D major
* BWV 937 — Little Prelude in E major
* BWV 938 — Little Prelude in E minor

Five Preludes from the collection of Johann Peter Kellner (939–943)
* BWV 939 — Prelude in C major
* BWV 940 — Prelude in D minor
* BWV 941 — Prelude in E minor
* BWV 942 — Prelude in A minor
* BWV 943 — Prelude in C major

Sorry for the sloppy writing in my previous post. The editions I consulted showed Eb of course (not just E).