Cell output removal broken?

Hi, I'm having an issue with the removal of cell outputs through the `tag_remove_configs` config settings. Despite attaching the configured cell tags, they still show out in the rendered output page. Curiously enough, the tags that seems to be working fine are `Remove_cell` and `Remove_input`, but not the ones that remove the outputs. Here's my `mkdocs.yml` for a minimum reproducible example (the settings come straight out of the official `mknotebooks` examples): ``` site_name: My Docs theme: readthedocs plugins: - mknotebooks: execute: true # https://github.com/greenape/mknotebooks/blob/master/examples/cell_tag_remove/mkdocs.yml # See the following for how to add the tags to cells: https://jupyterbook.org/en/stable/content/metadata.html#jupyter-cell-tags tag_remove_configs: remove_cell_tags: - Remove_cell remove_all_outputs_tags: - Remove_all_output remove_single_output_tags: - Remove_single_output remove_input_tags: - Remove_input ``` This is the JSON source of the notebook (containing a single cell with the `Remove_all_output` tag): ```json { "cells": [ { "cell_type": "code", "execution_count": null, "metadata": { "tags": [ "Remove_all_output" ] }, "outputs": [], "source": [ "print(\"Hello\")\n" ] } ], "metadata": { "language_info": { "name": "python" } }, "nbformat": 4, "nbformat_minor": 2 } ``` Looking at the generated HTML page, I see that the cell has a class attached to it that corresponds to the cell tag (`celltag_Remove_all_output`), but I was under the impression from the [`nbconvert` docs](https://nbconvert.readthedocs.io/en/latest/removing_cells.html) that the `TagRemovePreprocessor` would completely remove the node from the generated HTML (if it is working as intended). As a workaround, I have been hiding the outputs manually using CSS, but I'd like to understand if I'm doing something wrong, or if the behavior I'm seeing is indeed unintended. Thanks for your support!