I can also confirm that PIN scrambling for SIM unlock DID work prior to A14.
I started using Graphene about 2 months ago, on a P6P, and have a physical SIM card.
PIN scrambling worked for both the initial SIM unlock after reboot, and the lock screen.
Ever since A14, PIN scrambling only works for lock screen, and the initial SIM unlock is the normal arrangement of numbers.
Not sure if this is a bug/oversight, or intentional, due to the possibility of locking the SIM card after 3 incorrect tries.