FM-World
It will be necessary for somebody who is in Pakistan and has a Pixel device to try installing GrapheneOS and enabling the 5G forcing toggle. As I understand it, at present zero of the GrapheneOS developers are in Pakistan. If that is accurate, then the GrapheneOS project is genuinely very unlikely to take any action at least until somebody who is in Pakistan tries the existing workaround and reports that it doesn't work.
It is implausible that the GrapheneOS project can (potentially) address a 5G problem with specific carriers in Pakistan without data from Pakistan. Posting on the forum without detailed data from Pakistan won't do it.
Please note that I don't speak for the GrapheneOS project.