2.3.0 will add support for Drupal 12. Support for Drupal 10 and earlier versions of Drupal 11 have been removed, but will be maintained on the 2.2.x branch of the module.
Numerous changes were made to the module as part of the upgrade process. Mostly, this consisted of implementing new APIs from Drupal Core. They shouldn't have any impact on the module's functionality, but if you experience any problems, then please create an issue.
This new version adds support for Drupal 11 and drops support for unsupported versions of Drupal Core. There are also a number of bug fixes included which were mostly related to invalid HTML, accessibility issues, or both in the style guide.