[Matoro342]

Thank you, I've implemented those changes to clean up the code.

I've tried IsItemLinkBookKnown(itemLink) but it returns errors, I assume it only works on books or style pages.

In CharacterKnowledge Internal.lua, they use:

Internal.KnowFunctions = {
    [Internal.CATEGORY_RECIPE] = IsItemLinkRecipeKnown,
    [Internal.CATEGORY_PLAN] = IsItemLinkRecipeKnown,
    [Internal.CATEGORY_MOTIF] = IsItemLinkBookKnown,
}

And their stated use case is specifically limited to just those items. I will keep looking though as time allows through the API for potential solutions. Really appreciate your continued support.