Why can't kepler map in jupyter notebook be rendered on nbviewer

I'm trying to figure out why my map can't be rendered on nbviewer

e.g. https://nbviewer.jupyter.org/github/zyxue/scratch/blob/master/display-kepler.ipynb?flush_cache=true

I've compared the network activities between nbviewer (left) and jupyter notebook environment (right), still can't figure out why

reference: https://github.com/keplergl/kepler.gl/blob/master/docs/keplergl-jupyter/user-guide.md

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