In the TNG episode "Relics" where Scotty returns, Data serves Scotty a glass of a green liquid which he cannot identify. The drink is later identified by Picard as Aldebaran Whiskey, which seems to be a fairly well-known liquor during the TNG era. It makes appearances throughout the franchise, and Quark at DS9 keeps several barrels of it in a storeroom.
Given his usual penchant for being a walking encyclopedia, how was Data not able to identify Aldebaran Whiskey... or even recognize the language on the label as Aldebaran?
And, yes, I realize the scene was a nod to Scotty's identical scene in a TOS episode. I'm looking for an in-universe reason. At the very least, Data should have known it was Aldebaran.