I-485 through Asylum denied because of primary's status change

[legalimmihelp]

Looking for advice on a derivative asylee I-485 denial after 7.5 years of pending. Here is the situation.

• Primary and Beneficiary has now been married for more than a decade
• Primary filed for asylum and received interview in 2014
• Primary got married during the wait time and eventually added beneficiary during the interview process
• Primary's asylum got asylum approved in 2014
• I-730 was filed for beneficiary shortly after primary's asylum approval.
• Beneficiary asylum was approved in September 2017
• I-485 was filed in July 2018 along with an I-602 to address a minor older immigration matter that is well within waivable grounds under INA §209(c) .
• I 485 application stayed in pending for more than 7.5 years
• Within those years, couple made multiple documented attempts to reach USCIS through service inquiries, a senatorial inquiry, and a congressional inquiry over the years with "no" meaningful response
• Primary naturalized in March 2021 not knowing it could affect beneficiary's pending case. USCIS never warned them that despite the ongoing inquiries
• Despite the naturalization, USCIS issued a medical RFE for beneficiary and conducted a full interview with beneficiary in 2025 four years later without raising any concern about primary's change of status and no notification or hints were provided in either occasions
• After this long wait and despite multiple inquiries, USCIS denied the I-485 citing that the principal is no longer a refugee due to naturalization in 2026.

Should couple fight the case on the basis of the procedural wait, despite multiple attempts made to urge uscis to adjudicate there were no action or notification, The focus is on reopening and fighting this denial on the asylee adjustment track under INA §209(b) rather than starting over with any other remedies. What would you do in this situation? how would you tackle the denial legally?