"Ich bin voll" ist kein gutes Deutsch. Schon den kleinen Kindern sagen wir es heißt "ich bin satt".
Caveat: "Ich bin voll" is not the usual way to say "I'm full" in the sense of "I'm not hungry any more", but "I'm tanked" [drunk]. For the former it should be "Ich bin satt". Though "Ich bin voll" can also be colloquial to say I'm bloated with food.
But the sentence makes absolutely NO sense.
Not every sentence makes sense in Duo.
"I am full, though i am hungry" marked wrong. It corrected "though" to "yet". Doesn't it mean the same?
About fifty five years ago, when visiting Germany with my school, we were advised not to say "Ich bin voll." We were told that it meant "I am drunk!" Has this changed?
Definitly not! You can say: (Danke) ich bin satt. That sounds more polite...
Story of my life
I am full, but I'm still hungry ... was marked WRONG :-(
Same situation as Christophe86031, why yet instead of though
Why does this sound like a profound statement by some ancient philosopher?
Why the verb does not get moved to the end of the subordinate sentence?
Ich bin voll (or satt), doch ich Hunger habe.