A Facebook post purporting to show Dunkin’ instructing baristas not to fill iced beverages all the way to the top — even when customers ask for less ice — has enraged patrons.

The alleged leak, anonymously shared Monday in the Dunkin’ World Facebook group , appeared to display specific pour levels for dozens of drinks including iced lattes, macchiatos, matchas, chai drinks, cappuccinos, Americanos and shaken espressos.

The image posted to the group, which has more than 567,000 members, showed cups marked with an “ice line” that the instructions said should guide all iced-beverage pours.

Under the alleged rules, workers are told to pour the same amount of liquid regardless of whether customers request regular ice, less ice or no ice at all.

The Facebook user who posted the photo cla

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