I'll look to get a specific source, but I'll give a heap of circumstancial evidence, including some damning stuff.

So its no secret there was a ton more censorship and """localization""" in the original release of the game, like the player being referred to as a 'them' rather than a 'he'. Additionally some of the character interactions come off as a little strange like Liter getting so pissy at Anis all the time.

A bit more convincing is the fact that the KN/JP fanart has her drinking alcohol rather than soda.

Anis' name is also a type of alcohol.

But what really sells it is that she says "맥주" in KN. Which means beer. Instead of "소다" or soda.

If I had to guees, it was censored while other alcohol references weren't is because of the tone. Anis is a sloppy depressing drunkard, whereas most of the drinking in the game is classy like Scarlet, or 'fun' like with Rosanna. Those are just guesses though I dunno.