I'm afraid I can't help more than that; it looks like all the points of the entire mesh are getting collapsed to the centre but I'm not sure what could be causing that at this stage, and without access to the hardware, testing is going to be a serious pain.
If you're technically minded you can grab the source off github and see if you can figure out where in the shader all the points are going to 0,0,0 - but I understand it's a pretty big ask, haha.
Thanks for your interest, sorry I couldn't sort it out.