Notebook %psource magic command not displaying

[ivanistheone]

Describe the bug

context
I'm using the %psource magic command to display the source code of a helper function, but the output doesn't show up in the .html build of this notebook.

expectation
I expected the source to be printed below just like in JupyuterLab:

bug
But instead nothign appears below the cell:

see online version here: https://nobsstats.com/examples/one_sample_t-test.html#p-value-calculation

problem
This is a problem for people trying to use magic commands as part of educational notebooks.
I'm a big fan of %pdef and %psource and I want students to learn to use these powerful tools.

Reproduce the bug

1. Create notebook that uses %psource command
2. Use jupyter-book build . to build html
3. Inspect the notebook html built version

List your environment

I'm on mac running Python 3.9.4

jupyter-book --version
Jupyter Book      : 0.13.2
External ToC      : 0.3.1
MyST-Parser       : 0.15.2
MyST-NB           : 0.13.2
Sphinx Book Theme : 0.3.3
Jupyter-Cache     : 0.4.3
NbClient          : 0.5.13

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