v3.0.0: CodegenParameter examples have values like “param_name_example” instead of actual value

This is only actual for examples of API parameters provided in the yaml file. Examples for models properties are working fine.
For example, this code

  @Override
  public void postProcessParameter(CodegenParameter parameter) {
    super.postProcessParameter(parameter);
    if(parameter.example != null) System.out.printf("Example for %s is %s\n", parameter.paramName, parameter.example);
  }

will output

Example for portfolio is portfolio_example
Example for ticker is ticker_example
Example for query is query_example

Start by tracing CodegenParameter.postProcessParameter and how API parameter examples from the YAML definition are assigned. Compare that path with the working model-property examples, then verify that parameters with explicit YAML examples retain their actual values instead of generated placeholder text.