Similar situation here. Filed I-751 in July 2021, Attended N400 interview in November 2022, and passed the civics test The officer then realized my I-751 was at the Potomac Service center and said he'd have to have it transferred over to the local office. (which did happen) Was provided an RFE, for which I submitted the documents before the December deadline. I've been waiting ever since. These delays are extremely frustrating!!!!