Change record status: 
Project: 
Introduced in branch: 
12.0.x
Introduced in version: 
12.0.0
Description: 

The Stable 9 theme is removed.

The Stable 9 theme was deprecated in Drupal 11.4.0 and the theme moved to contrib at https://drupal.org/project/stable9

If you need the functionality provided by the Stable 9 theme, read the recommendations for the Stable 9 theme.

Impacts: 
Site builders, administrators, editors
Themers
Site templates, recipes and distribution developers