Rules Guy: My playing partner accidentally hit my ‘lost’ ball. What now?

Two people are standing on a golf green; one holds a flagstick while the other gestures with a golf glove, possibly discussing a lost ball. Trees and a pond are in the background under a cloudy sky. A Rules Guy golf logo is at the top right corner.

What do the rules say about what to do when you discover your playing partner hit the ball you thought you lost?

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