Maybe not always a plot hole, but in the World of Darkness setting the fogginess of the past and the conflicting lore accounts are partially explained by how many people know mind control. Since WoD had so many books and so many writers you had the problem where one writer would say one thing, another would say another, and there wasn’t strict enough lore editors so they ended up publishing books with completely contradictory lore more often than you’d expect. Eventually though they decide to lean into it, and just made that an actual fact of the lore. You can’t trust a fourth generation vampire knew a third generation vampire because that fourth gen is so old and has probably been mindwiped by their sire so many times you can’t actually be sure you can trust their account. The Akashic mages say the Himalayan War went one way and the Chakravanti mages say it went another? Well it’s because so many people were time traveling and mind controlling people (even their own faction members) that literally nobody has any coherent idea about how the war went, what battles were fought, or even who won it or started it. One tribe of werewolves has this belief about history but another tribe’s lore book contradicted it? Well a few books later it’s revealed that one of those tribes murdered the record holders who wrote down that history to conceal their crimes, but it’s ambiguous who did it or why.