Incompatible with simple_sitemap 8.x-2.12

This doesn't work with the latest simple_sitemap module. See https://www.drupal.org/project/simple_sitemap/releases →

API changes

In #2923551: Make generators pluggable through plugins the URL generator have been refactored into plugins. It is now possible to create new generators or alter existing ones through the new hook hook_simple_sitemap_url_generators_alter(&$generators). See module documentation and gbyte.co/projects/simple-sitemap for more details.