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Exploded animation from Blender-generated GLB file not animating when parts are contained within a group object

cell.blend cell.glb

I am trying to render an exploded animation with the attached GLB file, created by the attached Blender file. It is a simple linear exploded animation, and the slider appears in GB3D, but the animation doesn't show.

The animation does explode and work properly when rendered with https://gltf-viewer.donmccurdy.com/

@julianstirling commented on gitter "Right, I have done a bit of digging in the GLB file. I think the issue is that all your parts fall in another group object and GB3D isn't clever enough to look in there for the bits it should animate"