horde https://paraben.com/e3-forensic-platform-3-6/ (version 3.6 SUMMER 2023)
They mention GrapheneOS in every new release of their software.
Paraben are not a serious digital forensics vendor. Their capabilities are just logical, consent (requires password) extractions. Logical extractions are the least capable extraction type and is equivalent to just backing up your device when plugging it into a PC. They don't even have full file system extractions like what Cellebrite or MSAB have. You can see "Partial File System“ on their list. They don't have exploits.
They also have a video on YouTube about their GrapheneOS "support" which shows you how limited their extraction scope is: https://www.youtube.com/watch?v=FaK9Q8VVysk - Worth noting Cellebrite gives you the same amount of information by plugging a GrapheneOS device that has no password into a UFED and doing a generic logical extraction.
It's not worth being concerned over. There are bigger industry players to focus on. Everything they mention they can extract for a GrapheneOS device where they need to know the password is the bare minimum as far as mobile forensics is concerned.