Can a party withdraw consent to trial before a magistrate judge?

Once a civil case is referred to a magistrate judge under 28 U.S.C. 636(c), the reference can be withdrawn only "for good cause shown on its own motion, or under extraordinary circumstances shown by any party." 28 U.S.C. 636(c)(4); Dixon v. Ylst, 990 F.2d 478, 480 (9th Cir. 1993) (stating that "[t]here is no absolute right, in a civil case, to withdraw consent to trial and other proceedings before a magistrate judge."). A referral to a magistrate judge will not be vacated where a party has

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