Watch windows not updating correctly when debugging C++/CLI 2D arrays

Question

I'm debugging a C++/CLI assembly. In the assembly, I have a 2D managed array declared like this:

array<char, 2> ^classifications;

I have four variables I'm using to access positions in the array:

int x, y, dx, dy;

In the Watch window, this expression works:

classifications[y, x]

However, this expression does not update when the values of dx and dy change:

classifications[y + dy, x + dx]

Does anyone know why it's not working? To be clear, this is a debug build and I've tried a clean rebuild with no success.