Trickster UMD 3 rank wizard spellbook not counting as prereq. for Loremaster class/Loremaster spellbook selection

[Sabbelwookie]

No matter whether I disable TTT's table top prereqs for Loremaster(LM) or not, my trickster has picked UMD rank 3 around level 17, which gives him a wizard spellbook (arcane lv 3 spells included), so I have all prerequisites for the LM prestige class. Still, the game doesn't let me pick LM. When I disable class-prerequisites in Toybox/TTT for class selection, I can pick LM, but when the spellbook selection screen is shown, it is empty, though I should have the wizard spellbook (from trickster). The description is very clear in the class prerequisites saying either arcane or divine spells of at least lv 3, which I have.

Is this a bug in the main game or do I misunderstand something in the LM prereqs? Is there a possibility for TTT to include a fix for this?

Thanks!