PCIe 4x edge socket causes filled zones to not form?

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i pressed b several times but gnd pour does not form unless i remove the PCIe slot

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I’m a relatively new user myself… so might not be right about this… Anyway, my guess:

The PCIe connector includes a partial PCB outline (the white Edge.cuts layer) to define the shape of the PCB around the connector. I reckon once you have a partial outline like this, the copper pour might not form any more until you define a complete PCB outline connecting the endpoints and enclosing your whole PCB?

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