Editor crashes on switching Colorspace Linear to Gamma with Direct3D12 Graphics APIs.

Steps to repro:
1. Create a new HDRP Template project.
2. File > Build Settings > Player Settings.
3. Other Settings > Change Graphics APIs to Direct3D12.
4. Restart the Editor.
5. Change Colourspace to Gamma.

Actual Result:
Editor crash on changing Colorspae to Gamma.

Expected Result:
Colourspace changes to Gamma.

Reproducible in:
2020.2.0a2, 2020.1.0b1, 2020.1.0a26, 2020.1.0a24 with Package Version: 8.0.1, 7.2.1.
2020.1.0a23 with Package Version: 7.2.1.

Working fine in:
2020.1.0a23 with Package Version: 7.1.8, 7.1.7.

Note: 2020.1.0a2 Editor crashes on switching Graphics APIs to DXD12.

Environment:
Occurring on Windows 10.

========== OUTPUTTING STACK TRACE ==================

0x00007FFFB00BF080 (d3d12) D3D12PIXReportCounter
0x00007FFFCBFF1ACE (nvwgf2umx) NVAPI_Thunk
0x00007FFFCBFE2461 (nvwgf2umx) NVAPI_Thunk
0x00007FFFCBFDC16D (nvwgf2umx) NVAPI_Thunk
0x00007FFFCBFE51FB (nvwgf2umx) NVAPI_Thunk
0x00007FFFCC1BF297 (nvwgf2umx) NVAPI_Thunk
0x00007FFFCB71E52C (nvwgf2umx) OpenAdapter12
0x00007FFFB011B9F1 (d3d12) D3D12PIXReportCounter
0x00007FF763662FA9 (Unity) GfxTaskExecutorD3D12::UnmapTiledSubresource
0x00007FF76367C4AA (Unity) TiledTextureManager::CheckMemoryBudgetAndUpdateTiledResources
0x00007FF7636A2105 (Unity) GfxDeviceD3D12::QueuePresent
0x00007FF763669D59 (Unity) D3D12Window::EndRendering
0x00007FF7664E154A (Unity) GfxDeviceWorker::RunCommand
0x00007FF7664E40AC (Unity) GfxDeviceWorker::RunExt
0x00007FF7664E4498 (Unity) GfxDeviceWorker::RunGfxDeviceWorker
0x00007FF764468E80 (Unity) Thread::RunThreadWrapper
0x00007FF8097B7BD4 (KERNEL32) BaseThreadInitThunk
0x00007FF80A5ECED1 (ntdll) RtlUserThreadStart

========== END OF STACKTRACE =====================