This is dependent upon which form of English you speak. Neither is more correct than the other just as no one language’s grammar rules are any “more correct” than any other language’s rules.
You don't need a hyphen when the modifier ends in -ly. From the Chicago Manual of Style:
Compounds formed by an adverb ending in ly plus an adjective or participle (such as largely irrelevant or smartly dressed) are not hyphenated either before or after a noun, since ambiguity is virtually impossible. (The ly ending with adverbs signals to the reader that the next word will be another modifier, not a noun.)
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