CLI does not set TFM net5.0 in .csproj

[VARUN46]

Describe the bug

When I Create a new application from Dotnet CLI the .csproj does not show correct TFM in .NET 5 Preview 3

To Reproduce

Create A New Project using CLI,
dotnet new mvc -o WebApp5.Mvc -f netcoreapp5
Open .csproj

<PropertyGroup>
  <TargetFramework>netcoreapp5.0</TargetFramework>
</PropertyGroup>

dotnet run

Additional Details:
Change To This:

<PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
</PropertyGroup>

dotnet run

Both works correctly!!

Further technical details

• ASP.NET Core version : 5.0.100-preview.3.20216.6
• Include the output of dotnet --info

.NET Core SDK (reflecting any global.json):
Version: 5.0.100-preview.3.20216.6
Commit: 9f62a32109

Runtime Environment:
OS Name: ubuntu
OS Version: 20.04
OS Platform: Linux
RID: linux-x64
Base Path: /home/setia/dotnet/sdk/5.0.100-preview.3.20216.6/

Host (useful for support):
Version: 5.0.0-preview.3.20214.6
Commit: b037784658

.NET SDKs installed:
3.1.201 [/home/setia/dotnet/sdk]
5.0.100-preview.3.20216.6 [/home/setia/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 3.1.3 [/home/setia/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.0-preview.3.20215.14 [/home/setia/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.3 [/home/setia/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0-preview.3.20214.6 [/home/setia/dotnet/shared/Microsoft.NETCore.App]

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

• The IDE (VS / VS Code/ VS4Mac) you're running on, and it's version : VS Code 1.44.2 on Ubuntu

[mkArtakMSFT]

Thanks for contacting us. This is already being handled as part of #20748