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Privacy plugin does not download Twemoji SVGs

See original GitHub issue

Contribution guidelines

I’ve read the contribution guidelines and wholeheartedly agree

I’ve found a bug and checked that …

… the problem doesn’t occur with the mkdocs or readthedocs themes
… the problem persists when all overrides are removed, i.e. custom_dir, extra_javascript and extra_css
… the documentation does not mention anything about my problem
… there are no open or closed issues that are related to my problem

Description

With the privacy plugin enabled, the src for emojis points to twemoji.maxcdn.com.

Expected behaviour

I would expect Twemoji SVGs to be downloaded and bundled with the site:

The built-in privacy plugin scans the resulting HTML for links to external resources, including external scripts, style sheets, images and web fonts, and downloads them to bundle them with your documentation site.

Actual behaviour

With the privacy plugin enabled, references to emojis are inserted as images with a source pointing to MaxCDN.

Steps to reproduce

Enable the !!python/name:materialx.emoji.twemoji emoji index.
Enable the privacy plugin.
Insert a non-bundled emoji in a doc.

Package versions

Python: 3.7.13
MkDocs: 1.3.0
Material: 8.2.8+insiders.4.12.0

Configuration

site_url: "https://example.com/"
site_name: My Docs

theme:
  name: material

plugins:
  - search
  - privacy:
      externals_exclude:
        - cdn.jsdelivr.net/npm/mathjax@3/*

markdown_extensions:
  - attr_list
  - pymdownx.emoji:
      emoji_index: !!python/name:materialx.emoji.twemoji
      emoji_generator: !!python/name:materialx.emoji.to_svg