Pupil Animation Not Working in Project Polly

[cx20]

I tried to display the following model in the glTF Sample Viewer.
When I did so, I noticed that the pupils of the eyes were not animated. Is this a problem with how I'm using it?

https://github.com/KhronosGroup/glTF-Blender-Exporter/blob/master/polly/project_polly.glb

https://github.khronos.org/glTF-Sample-Viewer-Release/

https://cx20.github.io/gltf-test/examples/babylonjs/index.html?url=https://raw.githubusercontent.com/KhronosGroup/glTF-Blender-Exporter/master/polly/project_polly.glb

[cx20]

Below is the expected result.

https://youtu.be/l7TB1O51X_M?t=12

[UX3D-haertl]

This seems like a bug. But the asset does have validation errors: weights for mesh 7 are not normalized. But mesh 7 is the body and not the eyes so this might be unrelated. I will investigate it further