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3D Canvas Export covers Mounting Holes with SolderMask

I am using PCB Designer 17.4(S027). This is what i see in 3D Canvas.

When I export this Step File using 3D Canvas> Export. This is what i get:

As seen here, Holes on the left are being covered by SolderMask. I can see there are holes under Soldermask when i hide the Soldermask layer.

Interesting thing is the holes on the right are exactly the same as the ones on the left(Footprints and not connected to any net).

Workaround for this i am using is to define Package Geometry>Soldermask Top/Bottom for the holes on left and then it is able to export it properly.

This problem i have encountered earlier also, where holes were connected to Gnd net.

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