This is really interesting to me, given my issues. I am on a one iteration earlier of Verizon Plan (the Get More Unlimited) with 75gb premium data, and they added 5G provisioning to the plan when I activated the 12 Pro (even though prior it did not have 5G mentioned at all). So it now shows 5G on the plan.. though I never "switched the plan". I am wondering if what you are saying could be a resolution for me. Though I am hesitant to switch since the new "Get More Unlimited 5G UW" plan only comes with 50GB of Premium Data, if it solves this for me... I'd do it. What good is an extra 25GB of data if it doesn't work at all. :-/.
@Packers1958 - you might be on to something.