Shape key + Assign material Issue

Hello.
I’m trying to use shape keys and the assign material puzzle.
ive made an example,

https://cdn.soft8soft.com/AROAJSY2GOEHMOFUVPIOE:43ea36360b/applications/Morph_Material/RuloV3D.html

all the shape keys work with “material 2” (the original one)
but if i change the material to “material 1” it seems like the texture doesn’t follow the mesh shape. (see the green edges)

for this example the replace texture puzzle will do the job, but not for my project which requires the assign material puzzle.

here are the project files.
https://drive.google.com/open?id=1NcFsQp1LZ-OLVEG9VfpJin6tvzqXeEVH

Verge3d 3.0.1
blender 2.82
browser chrome, firefox

thanks