With .NET 7 SDK 7.0.100-alpha.1.22071.3 & SDK 6.0.102, template conflict when creating a new console/classlib without specifying framework

[WenJunJi01]

Environment: .NET 7 SDK 7.0.100-alpha.1.22071.3 and SDK 6.0.102

Repro steps:

1. Install .NET 7 SDK 7.0.100-alpha.1.22071.3 and SDK 6.0.102 on a clean Windows OS.
2. Create a new console or classlib project without specifying framework.

Expected Result:
The project should be created successfully without errors.

Actual Result:
Template conflict when creating a new console/classlib without specifying framework.

C:\Users\v-wenjj>dotnet new classlib -o mylib1
Unable to resolve the template, the following installed templates are conflicting:
Identity                             Template Name  Short Name  Language  Precedence  Author     Package
-----------------------------------  -------------  ----------  --------  ----------  ---------  -------
Microsoft.Common.Library.CSharp.6.0  Class Library  classlib    C#        8000        Microsoft
Microsoft.Common.Library.CSharp.7.0  Class Library  classlib    C#        8000        Microsoft

Uninstall the templates or the packages to keep only one template from the list.

C:\Users\v-wenjj>dotnet new console -o myconsole1
Unable to resolve the template, the following installed templates are conflicting:
Identity                             Template Name  Short Name  Language  Precedence  Author     Package
-----------------------------------  -------------  ----------  --------  ----------  ---------  -------
Microsoft.Common.Console.CSharp.6.0  Console App    console     C#        8000        Microsoft
Microsoft.Common.Console.CSharp.7.0  Console App    console     C#        8000        Microsoft

Uninstall the templates or the packages to keep only one template from the list.

Note:
Creating a new console/classlib project with the specified framework can succeed.

Dotnet info:
.NET SDK (reflecting any global.json):
Version: 7.0.100-alpha.1.22071.3
Commit: b7180e5baf

Runtime Environment:
OS Name: Windows
OS Version: 10.0.22000
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\7.0.100-alpha.1.22071.3\

Host (useful for support):
Version: 7.0.0-alpha.1.22066.4
Commit: ae2f60c950

.NET SDKs installed:
6.0.102 [C:\Program Files\dotnet\sdk]
7.0.100-alpha.1.22071.3 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.0-alpha.1.22067.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.0-alpha.1.22066.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.0-alpha.1.22065.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
https://aka.ms/dotnet-download

[marcpopMSFT]

@vlada-shubina , let me know if there is anything the SDK team should do here to make this work.

[vlada-shubina]

PR is already ready: #4295

[vlada-shubina]

closed in #4295

[WenJunJi01]

With both .NET 6 SDK and .NET 7 SDK installed, unable to create .netstandard classlib even if framework is specified