Sure but that's often the case, not just in Pakistan but everywhere - the international cricket season always coincides with the domestic season, and has always done so. The 12 who will play the Tests against England will presumably all be contracted to PCB, so probably would not have been available for selection for their domestic teams anyway, unless Woolmer and Inzamam gave someone leave to play a match to work on something.

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A lie can travel halfway around the world while the truth is putting on its shoes
Mark Twain