OptionaldatasetOptionalentityOptionalerrorOptionalpermissionTrue when this config was skipped because the current user lacks read
permission on its entity. The data array will be empty [].
OptionalreadTrue when a load of this config failed and the permission classifier said the user cannot
read the entity, so the config was loaded empty. Cache events never fill it; Config(true)
re-evaluates it.
Tracks the load state and data for a single engine property (entity or dataset config).