If I remember correctly some large seeds use the curve of the taproot to push the cotyledons out of the soil, the taproot is shaped like a U and the U straightens out to propel the seed leaves out of the soil. But with small seeds like hemp I don't see that being a problem, just the elongation of the taproot may push the leaves out, although that's not to say the taproot won't grow upwards initially. It seems like when I sprout seeds in water I see a hook-shaped taproot, but when I plant directly in soil I haven't seen orientation make any more difference than twelve hours as for how long it takes the leaves to pop out, and that could be due to variations in the plants or in the compactness of the soil the seed is in. IMO when germinating in soil orientation makes no difference whatsoever, who is aligning seeds properly out in the forest and meadows? The plants know how to deal with it.

BTW I have never had good results germinating cannabis seeds in water before planting, they either don't sprout or they die quickly. Maize sprouts just fine in wet paper towels for me though.