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cv::Mat_ compiling error

I have very simple program to use cv::Mat_, and I found a compiling error, it took a lot of time to figure out that I had problem with specific type of integer. I think it might be a bug in OpenCV. Can any one help me to understand the error? Thank you very much in advance!!!!!

I am using Visual Studio Community 2019. The codes as follows:

#include <opencv2/core.hpp>

#ifdef _DEBUG
    #pragma comment(lib, "opencv_core411d.lib")
    #else
    #pragma comment(lib, "opencv_core411.lib")
    #endif
 int main()
{
    cv::Mat_<cv::Vec<int, 3>> mat1;//This is OK
    cv::Mat_<cv::Vec<uint, 3>> mat2;//This causes compiling error. This is also for unsigned int
    cv::Mat_<cv::Vec3i> mat3;    //This is OK
}