On my 12 Pro Max, I had a physical SIM in the phone when it arrived....I did the quick transfer between my old 11 Pro and the new phone.
After the reboot when the transfer was complete, it showed 2 plans....both Verizon....both with my phone number.
I powered the 12 down, ejected the physical SIM, and booted back up....All is working fine on eSIM with no physical SIM n the phone.......
I did turn cellular off on my 11 before booting the 12 for the first time.....