Description
The widgets appear and work fine when I use pythreejs in notebooks.
When I save the notebook along with its state and build html docs using nbsphinx, the widgets do not appear when opening the html in a browser.
The widgets state data is present in the ipynb file and in the html file though.
As a minimal example, I tried it on this repo. On tag 4.2.1, I built the html docs, opened a html file in a browser and the widget appear and work. So the it seems the issue doesn't come from nbsphinx.
As soon as I open one of the notebooks in examples and execute it myself, save output and state, followed by building the docs again, the widgets do not appear.
Also when I run a notebook with another widget say ipywidgets.IntSlider, it works. So the problem doesn't seem to come from widgets in general.
I'm using pythreejs version 2.4.2 with
jupyter --version
Selected Jupyter core packages...
IPython : 8.18.1
ipykernel : 6.29.4
ipywidgets : 8.1.3
jupyter_client : 7.4.9
jupyter_core : 5.7.2
jupyter_server : 2.14.1
jupyterlab : 4.2.3
nbclient : 0.10.0
nbconvert : 7.16.4
nbformat : 5.10.4
notebook : 6.5.7
qtconsole : not installed
traitlets : 5.14.3
Any idea why my threejs widgets can't be converted properly by nbsphinx ?