When loading a mesh exported from assimp into Blender, it warns that it has an incorrect class.
While debugging, I traced it back to this being `Blendshape` where `Geometry` was expected. This
is likely because this node describes a `Geometry`, which is used as a blendshape. I'm not sure
if any other DCC tools or places to import it expect `Blendshape` instead (i.e. was this code
ever tested?), but it fixes its use in Blender.
a78817e04a