Chopin added the 
time signature marking to A after the basis for FE had been finished, which explains its absence in that edition. EE corrected the mistake by adding a 
, which was present in bar 1, which could be justified to a certain extent, as the Chopinesque Tempo primo indication may be misleading, since it seems to direct us to the beginning of the piece.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources; Corrections & alterations; Source & stylistic information
issues: Corrections in A, Errors of A, Errors repeated in FE
notation: Rhythm