Drag n Drop Gambler Patron scenario not having 'All In' drink in stock

[WeiJayTan]

I've visited the Drag n Drop after it refreshed many times in the same playthrough, and encountered the Gambler Patron scenario at least twice. Yet, I've never seen the 'All In' drink in stock.
Out of curiosity, is it guaranteed to appear in stock in that scenario or is it a chance to appear in stock in that scenario?

[PaposikG6]

It is not guaranteed to appear during gambler event but the chance for it to spawn is quite high. The stock might also be influenced by other variables that are not fully known.