According to the gTLD RDAP Response Profile

2.11. RDDS Inaccuracy - A domain name RDAP response MUST contain a notices
member with a title “RDDS Inaccuracy Complaint Form”, a description containing
the string “URL of the ICANN RDDS Inaccuracy Complaint Form:
https://icann.org/wicf” and a links member with the https://icann.org/wicf URL.

If a URL using the www.icann.org host is used (which does work), this issue gets flagged. We may want to consider looking for this case and either noting the issue to fix or show it only as a warning.