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I thought the purpose was incase a loss of pressure will create a vacuum in the water system and suck stuff back in, like if someone left a pesticide hose attachment on the hose.
Or a firetruck is attached to a hydrant and causes a drop in water pressure. My dad told me years ago stories of sucking water out of water heaters with the fire truck. Is the PRV on a water heater also a vacuum breaker? I don't know where the air get in to let that happen if it doesn't let it in so it doesn't implode.
We don't have them where I live, no codes pretty much.
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