[solved] Can't use Crossgen2 in .net 6

[imba-tjd]

I typed:

dotnet new console
dotnet publish -r win-x64 -p:PublishReadyToRun=true -p:PublishReadyToRunUseCrossgen2=true

which outputs:

Microsoft (R) Build Engine version 16.9.0-preview-21103-02+198f3f262 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  Restored C:\test\test\test.csproj (in 110 ms).
  You are using a preview version of .NET. See: https://aka.ms/dotnet-core-preview
  test -> C:\test\test\bin\Debug\net6.0\win-x64\test.dll
C:\Program Files\dotnet\sdk\6.0.100-preview.1.21103.13\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Publish.targets(399,5): error : Could not resolve CoreCLR path. For more details, enable tracing by setting COREHOST_TRACE environment variable to 1 [C:\test\test\test.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.1.21103.13\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Publish.targets(297,5): error NETSDK1096: Optimizing assemblies for performance failed. You can either exclude the failing assemblies from being optimized, or set the PublishReadyToRun property to false. [C:\test\test\test.csproj]

But if I change the target framework to net5.0, it will compile.

This is the output when I set COREHOST_TRACE: https://gist.githubusercontent.com/imba-tjd/aa4ee703f848692265e00ede29d42c31/raw/crossgen2_err.txt

I have installed preview 2 and this issue disappeared.