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Could be caused by a module which doesn't provide a base path for a config entity, see for example:
https://www.drupal.org/project/dynamic_layouts/issues/3002255
https://www.drupal.org/project/password_policy/issues/2703717
https://www.drupal.org/project/paragraphs_entity_embed/issues/3014901
https://www.drupal.org/project/search_api/issues/2919676
https://...
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Drupa8 - as a Symfony application - abstracts paths with routes. So paths may change, the route stays.
So the cited "The internal: scheme should be avoided except when processing actual user input that may or may not correspond to a Drupal route." means: If you can, use a route.
If you can not use routes, the right prefix for routed paths is internal:.
In ...
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