Had a slippery moment on sand myself the other day.

I was slow, but leaned over. Buttpucker.
The bitch about sand is..... it's often invisible unlike gravel, oil, (wet) leaves/grass.
One of my least favorite things about riding, is spending hours happily riding my ride, then slipping around on sand or tiny gravel. If I hit it once, I may hit it again, and soon. It's a stealthy fun governor.
I expect bad mojo on the edges, in the corners and kicked out from driveways/dirt cross roads, not all over the dang road.