A 28-year-old primigravida presents at 13 weeks gestation with a twin pregnancy. Transvaginal ultrasound shows a single placenta with an intertwin membrane that meets the placental surface at a 90-degree angle with no triangular placental projection. The membrane is thin (2 layers). The structure marked **B** in the diagram represents this sonographic appearance. Which of the following is the most important clinical implication of this chorionicity-amnionicity pattern?
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