The missing tie of c2 is probably an oversight of Chopin in A (→FC→GE1) – those are the last bars on the page, which favours distraction. The tie was added by Chopin in the proofreading of FE (→EE) as well as in GE2 (→GE3), probably on the basis of analogy with b. 79-80.
There is a similar situation in b. 662-663.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: GE revisions, Errors of A, Authentic corrections of FE
notation: Rhythm