If you have separate stockpiles and have Mason make the “Stack of Stone Bricks” they won’t be picked up or placed in any stockpile:
But when you place a non-divided stockpile down they sort the “Stack of Stone Bricks”
Have repeated this on different games, always the same results.
Windows 7 Home Premium 64-Bit
Intel® Core™ i7-4820 CPU @ 3.70GHz 3.70GHz
GeForce GTX 760 (2)