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I found out why and solved it. The most recent change I made was adding a plane and constraint it to a camera, so the plane always faces the camera. It was constrained to Y axis before. After I change it to another axis, which is -Y or -Z , I can do sneak peek and export to Verge3D gltf again.
I tried another blender file that I previously made, it runs Verge3D and sneak peek just fine. I guess something in my blender scene disturbs the script.