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In vampire campaign I gave Manfred invocation of Nehek, and two other spells from this line, yet they never showed up for him in battle, next to his avatar. It's just as if he didn't learn them at all. The same appeared in Bestmen campaign.
Reproduction: Launch attached save. In case problem don't appear, try levelling one of your wizzards to a level where he has more spells than he can support in battle. The first time this problem appeared for me was in Empire campaign, after I levelled a wizzard and main leader. Next turn all spells disappeared for all wizzards in battles.
Unsuccessful fix attempts: I reinstalled the whole game and deleted all game files in AppData and savegames in the process. Problem persisted.