Editor crashes on GfxDeviceD3D12Base::UpdateComputeResources on adding Vulkan to the Graphics APIs list when selected Graphics APIs is Direct3D12.

Steps to repro:
1. Create a new HDRP template Project.
2. Edit > project Settings > Player.
3. Other Settings > Uncheck "Auto-Graphics API for Windows" checkbox.
4. Add Direct3D12 > Restart the editor.
5. Add Vulkan Graphics APIs.

Actual Result:
Editor crashes on adding Vulkan to the Graphics APIs list.

Expected Result:
Vulkan Graphics APIs should be added without crashing the Editor.

Reproducible in:
2021.1.0b3 with Package Version 11.0.0.

Working Fine in:
2021.1.0b2 with Package Version 11.0.0.

Environment:
Occurring only on Windows 10.

Stack trace:
========== OUTPUTTING STACK TRACE ==================

0x00007FF70A43F7D3 (Unity) GfxDeviceD3D12Base::UpdateComputeResources
0x00007FF70C2D56AD (Unity) GfxDeviceWorker::RunCommand
0x00007FF70C2D9E3D (Unity) GfxDeviceWorker::RunExt
0x00007FF70C2D9F58 (Unity) GfxDeviceWorker::RunGfxDeviceWorker
0x00007FF70AA48C5E (Unity) Thread::RunThreadWrapper
0x00007FFAE7447034 (KERNEL32) BaseThreadInitThunk
0x00007FFAE8B5D0D1 (ntdll) RtlUserThreadStart

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