A small aluminum cover has a 0.4 mm edge break called out and a flatness of 0.02 on the seal face. If we break the edge first, the face sometimes goes out. If we face last, the edge is sharp again.
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Face the seal last, then break only the edge with a light chamfer tool or a nylon brush that does not load the face. A file or a wheel on the bench is what knocks the flatness out.
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If the edge break is on the seal boundary, model it and cut it in the same finish toolpath with a small spring pass. Hand deburr belongs on edges that are not datums.
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Check flatness after the deburr, not before. The number that matters is the face you ship.
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