OpenCV 空のMatに対するMat.cloneではdepthがセットされない

mat_clone.cpp

#include <iostream>
#include <opencv2/opencv.hpp>

int main()
{
    {
        cv::Mat src(0, 0, CV_32SC1);
        auto dst = src.clone();
        
        std::cout << "Mat" << std::endl
            << "src: depth=" << src.depth() << ", channels=" << src.channels() << std::endl
            << "dst: depth=" << dst.depth() << ", channels=" << dst.channels() << std::endl;
    }

    {
        cv::Mat_<int> src(0, 0);
        auto dst = src.clone();

        std::cout << "Mat_<T>" << std::endl
             << "src: depth=" << src.depth() << ", channels=" << src.channels() << std::endl
             << "dst: depth=" << dst.depth() << ", channels=" << dst.channels() << std::endl;
    }

    return 0;
}

Mat
src: depth=4, channels=1
dst: depth=0, channels=1
Mat_<T>
src: depth=4, channels=1
dst: depth=4, channels=1

https://github.com/opencv/opencv/blob/ba539eb9aad7571361657ea7e00a7c3efcc2f9ba/modules/core/src/copy.cpp#L325