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It's hard to tell if it's broken. But if it slipped of once it can do that again. In all my years I have never seen a single pivot spring fail on a ride.
Here is my suggestion, take it for what it's worth.

Remove brake from bike.

Go and get a small ROUND file, like a jewelers version. And round cause we are not trying to cause any edges.

Carefully, and with some cutting oil, file the notch just a bit to create a better seat for the brake spring.

Go slow and check often. Then take bike out and see how it works. Since it's rear brake a full on failure there won't be as bad as a front brake failure. Worst that will happen is you having a brake pad rubbing.

Aside from that contact the manafacture and see if you can get a replacement part.

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