A similar problem occurred on my computer after installing Windows 11 24H2.
Native resolution of my monitor is 2560x1440.
When I used this resolution in the game settings, there was no problem.
But when I set it to a higher resolution (scaling, DSR: 3620x2036), this problem appeared.
For me, in the “nVidia control panel” settings, “Manage 3D settings”, selecting game “Diablo III”, and setting “Image Scaling: On” solved the problem.