SeHwI' has been used to refer to a person ("I am an airplane controller" or "The controller is sleeping") in other sentences, so I think ghaHtaH should also be accepted here.
I can't find this sentence, though, so it was probably "deleted".
If it helps, I think it was in Location nouns, in Lesson 6 when on Crown level 2. I also sent a report, so maybe you can find it from there?
Location nouns unit, lesson 2 would be where nuqDaq is used - but I still don't see it there, I'm afraid.
Sometimes deleted sentences hang around like zombies and get shown to learners; I'm not sure whether there's anything we can do about them.
Well, thought I'd try. Thanks for the explanation.
I appreciate it! Identifying the unit (and, if you know it, the lesson number) is often useful. (The crown level is not; the decision which sentences to show at which crown level is not one we take.)
Since the amount of lessons increases with the crown level and I don't know how exactly, I assumed lesson 6 on level 1 and level 6 on level 4 might be different.
That's probably true, but we don't have any clue how Duolingo assigns those differences or how they relate to the lessons we have created.
If you're still trying to find this sentence, I just got it in Home Life lesson 2. (As a multiple choice question, with 'oH rather than 'oHtaH IIRC.)
And there, it does have ghaH as an accepted option, so we're all good.