When I tried to use the fingerprint reader in Graphene after I put on the new screen, I rec'd an error message (can't remember the details now). It wasn't a question of the new screen not being able to read my fingerprint, but of Graphene not allowing access via fingerprint at all.
Since I didn't get any other answers here, the easiest/fastest solution I could come up with was just to flash a clean install of stock Android, then reinstall Graphene. Then the fingerprint reader worked no problem.