I have a similar issue. My son replaced the screen with an authorized dealer. Initially, Apple folks told me that the service center my son went to only allowed to repair iPhone and ipad.. long story short, Apple did something and booted the same system with the same screen. It worked for four months, but when the battery died, my son didn't use it for a 4-month device; it was back to the same issue. My guess is you need to do something. They run some checks on a system with a T2 system. Based on the fact that it did work, I assume Apple uses tool that disables that check.