In bars 1 and 5 in CLI there are no naturals returning a1, d2 and f2. The signs were also originally absent in FEcor (→FE,EE), in which Chopin added all of them. A correct notation is featured in Ap too. Similarly as in all subsequent repetitions of this bar (bars 9, 13, 36 and 40).
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Omissions to cancel alteration, Authentic corrections of FE
notation: Pitch