We understand the GLTF 2.0 standard, and that Blender reported counts on a merged model will not be the same as reported in the simulator, as GLTF 2.0 will not merge vertices. Which is why I have used the imported model as an example.
But now all models are broken.
Although exported cube with 1 materials and its reported correctly at 24 verts.
Please DO NOT change the models you had created LODs for with 1.0.84.0 - the latest 1.0.86.0 seems to have an issue with vertex counts indeed.
I’ll get back to you on this topic ASAP.