Inner Config node is not visible when returned as Map<String, String>

[Tomas-Kraus]

Have following method in Config blueprint:

    @Option.Configured
    @Option.Singular("property")
    Map<String, String> properties();

and related config yaml:

data:
  provider.jakarta:
    ...
    properties:
      eclipselink.target-database: "MySQL"
      eclipselink.target-server: "None"
      eclipselink.weaving: false
      # Broken, this property is missing in PU properties
      eclipselink.logging.level: "FINEST"
      eclipselink.logging.level.weaver: "OFF"
      eclipselink.logging.parameters: true
      jakarta.persistence.schema-generation.database.action: drop-and-create

Node eclipselink.logging.level is not returned in properties Map.