Not had it myself, have heard of seeds sprouting and just having the cotelydons (seeds leaves) unless the first set of true leaves apear then it is a no go.
I have heard some savita varieties can take up to a week to show first set of true leaves.
If you look closely at the center of the cotyledons there is a little tiny bit of growth , hopefully this will grow out and everything will be ok.
The diesel ryder has some sativa influence from the hawaiian in it from the NYC diesel side of things and also from the haze in the lowryder2 side of things. the jems however is much more indica based.
Wish you luck, worst comes to the worst it'll mean starting another bean.
Peace
Growerz