Because I am using UVMap generated by Geometry nodes. See the attachments spreadsheet. And because I just instanced an object around my main model and need to have same UVs on instanced as a source object from I instanced. Hope it is clear now. PS. I lose instanced object UVs if I apply the geometry nodes. If the Verge3D supports the UVs generated by geometry nodes, it will fix my problem.
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