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Problem when using the cadence abstract generator

I now have problems generating an abstract view of a simple inverter. The cadence abstract generator has three steps, pin, extract, abstract. After each step, a view is generated, i.e. abstract.pin, abstract.ext and abstract. The abstract.pin view is no difference from my layout view, while abstract.ext view has all my little M1 pin shapes converted to M1 net shapes. The final abstract view preserves all these M1 net shapes but converts all the other M1 drawing shapes to M1 blockage shape. This results disconnections for the same net. For example, my OUT net now has two disconnected shapes, one on M1.net and the other on M1.blockage. I think this should not be right. Anyone has any idea on the correct way to generate abstract view?

Thanks.

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