12th-SS: You get 4x PzIV in Ph-B and 5x in Ph-C without a change in veterancy. It also seems you found an exception to the rule.
Erm.... pretty sure those are different PzIV's...... btw. J's and H's IIRC.
I don't think it's so much a rule or an exception to said rule so much as it something that seems prevalent, not blanket for sure, but pretty regular. The airborne deck is weird because those starting high vet infantry aren't even what's available later, so it is a difficult comparison to pull. The Vickers is easy because its in two phases with clear buffs to veterancy and availability. I'm not going to list all the ones from the closed Beta (I don't even remember tbh) but it is something that appears to be applicable to some degree to every deck.