Just got back from the Einbürgerungsamt myself. Everything in and correct bar my B1 language test, which I failed on my grammar. It was a close run thing with good scores in everything else. I've been told as long as I have everything else in and proof of a resit date booked, then I'm still eligible for dual citizenship. So it was satisfying to see everything get stamped and approved today. Just need to keep working on my German writing now.