I would say that "wineglass" as one word should be counted as acceptable
I've never seen it as one word before. But if you think it should be accepted, just report it.
What's the significance of 'op' here? Is it part of 'fyldt', as in filled to the top?
You could also say "is being filled up".
Just tried this and it didn't accept it.
What happened to Duo's famous tolerance to typos, here? Especially in longer sentences like this, a left out s or t happens frequently.