Bug: Color banding in fullscreen mode using DXGI_FORMAT_R16G16B16A16_FLOAT buffer

Could this be fixed please - Thanks alot.

Getting color banding in fullscreen (alt-enter) mode using DXGI_FORMAT_R16G16B16A16_FLOAT swapchain buffer. Swapchain in Windowed mode is ok.
GeForce driver 442.50+, GeForce driver 461.09

rtx2080, 30bit, displayport, wide gamut, directx 12