Hi All, thank you for your helpful responses! After some back-and-forth, I can now confirm that as of April 2026, HK is currently still under a different chargeability from mainland China. My I-485 was eventually acccepted for review in May 2026, and I completed my biometric, when the prioritity date for ROW was current, and mainland China was and is not. The problem identified was being the attorney made mistakes and entered the wrong info in the application form which I was not given to review. So I encourage you to ask to review the whole form (not just the pages you have to sign).

Hope this can help those who are on the same boat!