The mordent added in EE3 is a unifying addition of revision – this is the only place in which the 2nd bar of the theme, containing that motif, is devoid of mordent. Could it be that the ornament was overlooked in FE? It cannot be entirely ruled out; however, taking into account the fact that the first time the theme was presented the motif with mordent and the motif without ornament appear alternately twice (the first in bars 18 and 26, and the second in bars 22 and 30), we do not see the need to improve the text in the majority of the sources in this place.
Compare the passage in the sources»
category imprint: Differences between sources
issues: EE revisions
notation: Ornaments