dotnet pack No Longer Correctly Parses Semicolon-Delimited Build Properties Starting in 6.0.301

[wsugarman]

Describe the bug

My CI pipelines add build properties via the CLI option -p and use a semicolon (;) as a delimiter between multiple key-value pairs.
E.g. dotnet pack MyProject.csproj -c Release "-p:Foo=bar;PackageVersion=1.2.3-baz"

However, upon updating my .NET SDK version in the global.json file from 6.0.300 to 6.0.400, I noticed that my package versions were incorrect. Looking into it more, it seems like this has been broken since 6.0.301.

To Reproduce

I've been testing this on .NET 6 projects using versions 6.0.300, 6.0.301, and 6.0.400 of the SDK. You're welcome to use my own OSS project which has a single global.json file at the root of the repository: https://github.com/wsugarman/sweetener/blob/main/src/Core/Sweetener/Sweetener.csproj, but it should reproduce in a new .NET 6 library template. Simply toggle between different versions of the .NET SDK.

Worked previously, but now doesn't >= 6.0.301

> dotnet pack MyProject.csproj -c Release "-p:Foo=bar;PackageVersion=1.2.3-baz"

Continues to work

> dotnet pack MyProject.csproj -c Release "-p:Foo=bar" "-p:PackageVersion=1.2.3-baz"

Further technical details

> dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.400
 Commit:    7771abd614

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.22000
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\6.0.400\

global.json file:
  Not found

Host:
  Version:      6.0.8
  Architecture: x64
  Commit:       55fb7ef977

.NET SDKs installed:
  2.1.818 [C:\Program Files\dotnet\sdk]
  3.1.422 [C:\Program Files\dotnet\sdk]
  5.0.408 [C:\Program Files\dotnet\sdk]
  6.0.108 [C:\Program Files\dotnet\sdk]
  6.0.300 [C:\Program Files\dotnet\sdk]
  6.0.303 [C:\Program Files\dotnet\sdk]
  6.0.400 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 3.1.28 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.28 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.28 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Download .NET:
  https://aka.ms/dotnet-download

Learn about .NET Runtimes and SDKs:
  https://aka.ms/dotnet/runtimes-sdk-info 

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[PleasantD]

Seems to be the same issue as #27059

[baronfel]

We fixed this in 6.0.400-series builds. Thanks for reporting!