Fixed in Evernote 10.91.1* with the update that formats and highlights code blocks. Well done, Evernote! Now please add Julia to the list of supported languages. I mean, you already added Haskell... 🙂
* 10.91.1-win-ddl-public (20240604023825)
Editor: V 178.10.0
Service: V 1.109.4
Update: Although the automatic reformatting of -> etc. has been removed, the font used, still causes minor issues. Namely, the ampersand symbol for e.g. && boolen operators etc. is set in a font that is typically only used for comments. See example below.
Benito Epominati's post in Bugreport: New autoformatting messes with Codeblocks was marked as the answer