Make the book module a dependency
This module tries to alter a book service but does not depend on the module. This can cause an error during a fresh Drupal install and config import. https://www.drupal.org/project/book_tree_menu/issues/3263953
This module tries to alter a book service but does not depend on the module. This can cause an error during a fresh Drupal install and config import. https://www.drupal.org/project/book_tree_menu/issues/3263953