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I agree, both should be accepted. Report it.
By the way, it's an informal thing, not a southern thing. Northerners drop f more than southerners e.g. ara', ha', co' etc. as opposed to southern araf, haf, cof. Certain southern dialects use forms like af i, gaf i, wnaf i quite naturally too whereas you'd only get (mi) a' i, ga' i, wna' i in the north.