...another issue likely originating with the theme, rather than the extension:

Adding an "executable" code fence through markdown-exec, the rendering is completely broken when using the readthedocs theme:

• readthedocs theme:

• material theme:

To help with debugging, I have published my MWE:

• repo:mkdocs_playground
• readthedocs site: https://my-mkdocs-playground.readthedocs.io/en/latest/