does forge material override existing content?

Basically the title. While most forge games, stories, etc. are either in line enough (ruined king) or out of the way enough (hex mayhem) to jive with main universe, in cases of new events in forge contrasting old established canon (ie eldred being dead in mageseeker and alive in the novella) which one takes priority when planning for new stories?

PS: I choose to see this as a mistake, cause retro-actively making everyone and everything leblanc is really boring and kinda dumb.