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Ender 3 Pro bed is lower in the middle

Glass beds are rigid, they won't sag in the middle after a few days, or months, or years. So the problem might be the undercarriage levelling equipment. The screws may be unwinding or slipping somehow....
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Z-offset: 0.2 mm, 0.1 mm or the thickness of paper?

Measuring a gap with paper is just a rule of thumb. Personally I didn't measure anything, I've just made sure my bed is level and adjusted z-offset bit by bit until I was satisfied with the results. I ...

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