"C:\Program Files\Citrix\ICAService\NvFBCEnable.exe" -checkstatus gives me the result that FBC is disabled. After enabling FBC (-enable paramater) I cannot reproduce the issue anymore. I will do some further testing with this setting.
The Citrix documentation says this: https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/graphics/hdx-3d-pro/gpu-acceleration-desktop.html
[i]Install and upgrade NVIDIA drivers
The NVIDIA GRID API provides direct access to the frame buffer of the GPU, providing the fastest possible frame rate for a smooth and interactive user experience. If you install NVIDIA drivers before you install a VDA with HDX 3D Pro, NVIDIA GRID is enabled by default.
To enable NVIDIA GRID on a VM, disable Microsoft Basic Display Adapter from the Device Manager. Run the following command and then restart the VDA: NVFBCEnable.exe -enable -noreset
If you install NVIDIA drivers after you install a VDA with HDX 3D Pro, NVIDIA GRID is disabled. Enable NVIDIA GRID by using the NVFBCEnable tool provided by NVIDIA.
To disable NVIDIA GRID, run the following command and then restart the VDA: NVFBCEnable.exe -disable -noreset[/i]