oh wow, I had no idea. Thanks for the info!
I filed ROC on 02/17/2022, USCIS received it on 02/24/2022, got my receipt nr. MSC (due to filing G-1145 per message).
two weeks later I had my 24 months extension letter in the mail.
on 03/29/2022 I had my biometrics, on 03/17/2023 I received a 48 months extension letter. my ROC is still pending. I filed N400 on 05/09/2023 and have an interview coming up on 08/24/2023. I believe it'll be a combo interview.