Route "animatecss.settings" does not exist whan enabling the module

Problem/Motivation

Enabling the module the first time is sending the below error

In RouteProvider.php line 208:
                                               
  Route "animatecss.settings" does not exist.  
                                               

The error looks do disappear after the a drush cr but looks like these is the reason why animated settings done on a block from /block_layout are not exported to configs

Steps to reproduce

- uninstall animatecss module and all related module and make sure to "purge all configs" with a feature like what has the easy_install → module.
- try re-enable the the module with drush en animatecss_block