Can you elaborate on the unexpected behavior?
Have you tried a simpler Percentage type discount? (with specific collections, and minimum qty purchase)
Are you trying a configuration like the following
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Types = Buy X get Y
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Customer Buys: Minimum = Minimum quantity of items , Quantity = # , Any items from = Specific Collections
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Customer Gets: Quantity = # , Any Items from = Specific Collections
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Where both specific collections are the same collection the books are in?
Screenshot for UI settings of the above confg
