The b3 note on the last semiquaver of CLI and EE could be easily considered as a mistake except for the fact that in analogous bar 53 the sources have the same text. Therefore, it cannot be excluded that in CLI we are dealing with the original version, while in EE with the editor's revision.
Compare the passage in the sources »
category imprint: Differences between sources
issues: EE revisions, Errors in EE, Main-line changes, Errors of CLI
notation: Pitch