Yes, there was a big covid holdup, we got unlucky with the service center, he got processed as someone already in country and we weren't notified of the error for ages, the NVC site kept being down when I tried to check and I finally found a message saying they wanted another copy of my marriage certificate which they definitely already had, but I didn't get any separate notice of this... that kind of thing. I'm an American citizen by birth but in the meantime his dad has become a citizen and could have applied for him in the first place!