Yes, I also found this problem myself. Some software "intelligently" crop the blank margin of a postscript picture. Always this is just OK. But in some special cases, we set a blank margin of special purpose, for example, to leave some spaces for readers to add some notes. In these cases, the "intelligence" becomes "stupid".
I solve this problem by adding a invisible rectangle (with linewidth equals 0 or with color same as the background color and fillstyle onborder) as large as the screen, i.e.,
set object rectangle from screen 0,0 to screen 1,1 \ lw 0 fillstyle noborder behind
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