The marcatissimo indication is written in GC in such a way that it can be combined with the end of the scale in bar 95. Perhaps it was uncertainty concerning the correct placement that was the reason of its omission in GE1 (or maybe also in FE or EE, as the indication in GC is written with the copyist's hand and it had to be in at least one of the remaining Stichvorlage manuscripts).
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Interpretations within context; Differences between sources
issues: Errors in GE
notation: Verbal indications