Markdown summary dropdown icon does not show up

[jsignell]

On VEDA jupyterhub the dropdown icon next to details components is not showing up.

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Actual

Expected

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Context

I tested this locally on jupyterlab 4.1.5 - the same version as is in the pangeo image and I cannot reproduce. So I suspected that this has to do with jupyterlab-myst. I confirmed this by installing jupyterlab-myst locally and indeed am able to reproduce now. I am opening an issue upstream now

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1. HTML summary dropdown icon does not show up executablebooks/jupyterlab-myst#232
   bug +1