Runtime error on C++ API document

[toge]

I met a runtime error on C++ UDF example.

#include<duckdb.hpp>

int32_t udf_date(int32_t a) {
    return a;
}

int main() {
  con.Query("CREATE TABLE dates (d DATE)");
  con.Query("INSERT INTO dates VALUES ('1992-01-01')");
  con.CreateScalarFunction<int32_t, int32_t>("udf_date", {LogicalType::DATE}, LogicalType::DATE, &udf_date);
  con.Query("SELECT udf_date(d) FROM dates")->Print();
}

Error is following.

terminate called after throwing an instance of 'std::runtime_error'
  what():  Return type doesn't match with the first template type.

Following code works fine on my environment(Fedora Linux, gcc 14.2.1).

#include<duckdb.hpp>

int32_t udf_date(duckdb::date_t a) {
  return a.days;
}

int main() {
  con.Query("CREATE TABLE dates (d DATE)");
  con.Query("INSERT INTO dates VALUES ('1992-01-01')");
  con.CreateScalarFunction<int32_t, duckdb::date_t>("udf_date", {duckdb::LogicalType::DATE}, duckdb::LogicalType::INTEGER, udf_date);
  con.Query("SELECT udf_date(d) FROM dates")->Print();
}

Are there something wrong on my code?
Or should the document be fixed?