Actually that action, opening and re-exporting it using Blender has saved me tons of trouble with models and animations in the past.
Blender seems to normalize a few things that can help in similar cases.
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The problem here is that I donāt have that luxury, I have to procedurally treat files from my client in Playcanvas the way they are without any processing in the middle. Iām still not sure why it happens though. I presume it has something to do with mesh quantization as it is the only major difference between the two files, but I canāt tell exactly why the engine wouldnāt be able to digest that GLB with quantization only in the use case where itās loaded with script and as a collision (since the viewing part works)
Iām still investigating 
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Maybe you can ask a low-poly debug model from your client, so you could adjust your workflow with it.
Sadly my client has proven to be not very easy with anything 3D related, I decided to stop asking them things as they are not able to provide me a simple transformed/rotated or scaled mesh, I must admit I donāt have the best cards in hand right now 
So I found a solution for anyone in need :
It turns out my client was using GLTFPack that outputs mesh with KHR_mesh_quantization and that meshes with such parameters donāt work in AmmoJS
I requests from them to use -noq parameter when generating their GLB and now everything works fine 
Thanks a lot all for your help
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