New to the forum but wanted to write a post in case its helpful for anyone dealing with something similar.
I was DQ'd on Aug 8, got my IL Oct 20, and interview was Dec 5th.
At my interview, I handed over all the documents, answered all the questions, and then was told that they had everything they needed from me but that they would need to do additional processing on their end and was handed a white 221g refusal form (they didn't request any additional documents or anything). When I asked about my passport the officer said that she highly recommended that I keep it with them and so I did. Thankfully, I didn't receive the DS-5335 form then or by email later (you can bet I was holding my breath on that one). I can only assume that they wanted to carry out an additional security check because I lived in the US for several years as a student or to verify my foreign police certificate.
After reading the posts on this message group and the DS-5335 group, I didn't see many similar cases so I couldn't properly compare timelines and was prepared to wait it out for a few months. But thankfully this morning my status was changed to Issued! Still have no idea why I got the 221g but somehow it was resolved in just over a week.