Kind of a very late answer, but here goes anyway:
What type of shape is "Shape_1" ?
the "contains" function works builtin for all shape types except meshes, where it needs volume sampling information to work.
AFAIK There's no way in the UE4 plugin to bind a custom mesh to an attribute sampler with volume sampling info. And even if it's not an attribute sampler, it's a pain to setup in the popcorn editor due to the lack of automation, which forces you to do that manually.
If it's not a mesh but say, a sphere or box or whatever other basic primitive, it should work fine ?