LOSS OF G92 OFFSET AFTER POWER OFF

[sigraph]

when setting a work coordinate (corner pickup) with an edge finder I input the x and y values into the work offset column (G54) and add or subtract half the edge finder in the G92 column.
I'm using g92 like a common offset on a Fanuc controller.
After turning machine off and returning "later" G92 offset has reset to Zero.
Work coordinates are still good.
If I ran another toolpath without checking I'd be off by half the diameter of the edgefinder.
Why does it reset to zero?

[cncdrive]

It is not a bug. G92 is temporary offset, it is valid for the running session only and clears on power down.
If you need those permanent then you could write a macro to save the temporary offsets into the profile file on power down (M99999) and you could load and apply them to the DROs on power up (M99998).