System information (version)

• OpenCV => 3.2-dev
• Operating System / Platform => Windows 10 64 Bit
• Compiler => Visual Studio 2015

Detailed description

My program is

        Mat x(1, 2, CV_8UC1, Scalar::all(3)),y;
        cout<<x<<"\n";
        add(x, 2.0, x);
        cout << x << "\n";
        multiply(x, 2.1, y, 1, CV_32F);
        cout << y << "\n";
        multiply(x, x, x,1,CV_16UC1); // Line A to change
        cout << x << "\n";

results:
[ 3, 3]
[ 5, 5]
[10.5, 10.5]
[42025, 42025] : why?

Now instead of A I write
multiply(x, x, x);

[ 3, 3]
[ 5, 5]
[10.5, 10.5]
[ 25, 25] OK

instead of A I write
multiply(x, 2.1, x, 1, CV_32F);

results are
[ 3, 3]
[ 5, 5]
[10.5, 10.5]
[430.5, 430.5]

May be a clone is missing or an exception must be thrown when dts=src but type is changed