Problem/Motivation
The config schema for ai_translate module is defined in modules/ai_translate/config/schema/ai_translate.schema.yml.
The default config upon installation of the module is defined in modules/ai_translate/config/install/ai_translate.settings.yml, but does not follow the exact schema.
Noteably, the option `entity_reference_depth` is added within the reference_defaults array, instead of on its own.