The Blender mesh not working properly in Maya blendshapes.
Simply I create a sphere in Maya, then export OBJ format.
Import that OBJ in to blender, then go to editmode and Grab some vertices position to upward like an egg shape (without adding new vetices/loops).
Then export to OBJ format from blender.
Then again import that OBJ into previously created sphere Maya file. Now I have the both objects (sphere & egg shaped sphere) with same vertice counts. Then I create blendshapes to sphere object using egg shaped sphere. The blendshape will be created. when I drag the cursor to increase the blending value to 1.00 finally it’s look like an egg shape but in between transition the vertices collapsed.