Data point: https://np.reddit.com/r/USCIS/comments/boa88b/basically_forced_to_withdraw_application_at/
"He disappears and is gone for 10-ish minutes, apparently talking to a supervisor, comes back and tells me that my I-751 shouldn't have been processed because according to my divorce papers my wife and I separated 10 months prior to the I-751 being finalized, even though the final divorce date was 4 months AFTER that.
Essentially he gives me the option of having my application denied, detained and to go in front of an immigration judge and potential deportation, or "voluntarily" withdraw my application.
I was in complete shock, I've been living here perfectly happy with my 10 year green card not knowing there was some technicality that would prevent me from becoming a citizen, I ask if I can speak to someone else, he says no that he already spoke to his supervisor and that's where the options came from and that he couldn't offer me any kind of advice on the situation. He was extremely rude, blunt and not helpful or sympathetic at all. Pushed a blank piece of paper in front of me with a pen and made me write out that I withdraw my application."