Unknown parser settings when saving CommonMark parser

Problem/Motivation

When saving the CommonMark parser without changing any default configuration settings, observe Unknown parser settings error.

Unknown parser settings: allow_unsafe_links, enable_em, enable_strong, html_input, max_nesting_level, renderer, unordered_list_markers, use_asterisk, use_underscore

Steps to reproduce

• Use composer to require drupal/markdown:3.0.0-rc2 and league/commonmark:1.6.7
• Enable markdown module
• Go to /admin/config/content/markdown
• CommonMark (default) parse
• Scroll to bottom without changing any config
• Click save configuration
• Observer error

Proposed resolution

TBD

Remaining tasks

TBD

User interface changes

TBD

API changes

TBD

Data model changes

TBD