Originally I thought this was intended, but Kingdom still has theirs and Empire still have all the techs listed in the XML - they just don't show up in-game.

I'm talking about the series of technologies that unlocks new world resources on the map for empire.

For kingdom, it goes

The Lost Bounty > Lost Maps > Rare Resources > Secrets of the Nemesis

For empire it goes

Morrigan's Notes > Umber's Diary > Curgen's Journal

and then it ends.

I THINK it's supposed to be (resource-giving techs in green)

Morrigan's Notes > Umber's Diary > Curgen's Journal  > The Lost Bounty > Legend of the Bane > Kir Tions Codex

I believe the problem lies in the XML for the Lost Bounty,

Also, it appears that Empire do not have any technology that unveils new crystal world resources. Kingdom does. But if there's some balance thought behind this, rather than omission by fail, I can't say.