still being confused[*] by that thing where yet and still are roughly synonyms (massive difference in register notwithstanding) and "not yet" and "not still" are verging on antonyms. ("not begun" vs "already ended")
I think this is probably same thing as that weird English quirk where "must not" ≈ "may not" but "must" != "may"; the "not" scopes oddly with "must (not X)" vs "(may not) X".
[*] I mean, yes, I know that idioms are a thing. Doesn't stop these being weird.



