Double-Sided Material + Motion Vectors not compatible?

Unity Engine
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I am rendering a hair card model using a double-sided material. It appears that if “Motion Vectors” are enabled, the double-sidedness of the material is ignored. Is this normal? Or is there a setting somewhere that I need to change?

Edit: Seems to only happen with the Hair master node, and only when there is any kind of movement of the mesh. Tried a sample material that uses the node on a plane. Moving it around produced the same issue.


2

Just willing to upvote the topic. It is impossible to use a DoubleSided shader on a skinned mesh renderer.
if Skinned Motion vectors are on - the backside just disappears
if Skinned Motion vectors are off - the backside is invisible in motion and visible while static, so the picture is terribly glitchy