On Story Mode Origins - Chapter 1, level 2, “Anointer of Champions”, the player used to start with a Mage Ring Network in play, but now does not. Can’t confirm when this change happened, but I’m pretty sure it’s within the last couple of months.
After being told about this I tested a couple of other levels to see if there were bugs, and there were:
Story Mode “Heroic - Liliana” level 1 (note: this is the 1st level in the 5 levels titled “Heroic - Liliana”, not the only Liliana level in the top section marked “Heroic Encounters”!), Liliana starts the game with 0 cards in hand.
Story Mode “Heroic - Nissa” level 1 (note: this is the 1st level in the 5 levels titled “Heroic - Nissa”, not the only Nissa level in the top section marked “Heroic Encounters”!), both objectives register that the player has had 4 cards destroyed or exiled, before the game has even started!
So far, these are the only levels I’ve tested to see if there are bugs.