BuildImageFromDockerFileAsync does not tag images correctly

[talanw]

Output of dotnet --info:

PM> dotnet --info
.NET SDK:
Version: 8.0.101
Commit: 6eceda187b
Workload version: 8.0.100-manifests.69afb982

Runtime Environment:
OS Name: Windows
OS Version: 10.0.22621
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\8.0.101\

.NET workloads installed:
Workload version: 8.0.100-manifests.69afb982
There are no installed workloads to display.

Host:
Version: 8.0.1
Architecture: x64
Commit: bf5e279d92

.NET SDKs installed:
2.1.803 [C:\Program Files\dotnet\sdk]
3.1.101 [C:\Program Files\dotnet\sdk]
3.1.426 [C:\Program Files\dotnet\sdk]
7.0.100-rc.1.22431.12 [C:\Program Files\dotnet\sdk]
7.0.312 [C:\Program Files\dotnet\sdk]
8.0.101 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.All 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.26 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.0-rc.1.22427.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.32 [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 6.0.26 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.0-rc.1.22426.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.26 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.0-rc.1.22427.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.15 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
Not set

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

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

What version of Docker.DotNet?:

3.125.15

Steps to reproduce the issue:
Copy this code and run against a docker API service:

using (DockerClient RemoteDockerServer = new DockerClientConfiguration(new Uri($"https://dockerserver.com:8080"), CertCredentials).CreateClient())
{
using (var tarStream = new MemoryStream(TarBytes))
{
using (var ExtractedArchive = ArchiveFactory.Open(tarStream))
{
var TempDir = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
Directory.CreateDirectory(TempDir);
foreach (var entry in ExtractedArchive.Entries)
{
if (!entry.IsDirectory)
{
entry.WriteToDirectory(TempDir, new ExtractionOptions()
{
ExtractFullPath = true,
Overwrite = true
});
}
}

        var DockerFilePath = Directory.GetFiles(TempDir, "Dockerfile", SearchOption.AllDirectories).FirstOrDefault();
        string Tag = $"testingrepo:latest}";
        if (DockerFilePath != null)
        {
            tarStream.Seek(0, SeekOrigin.Begin);
            var buildParams = new ImageBuildParameters
            {
                Dockerfile = DockerFilePath.Substring(TempDir.Length).Replace("\\", "/"),
                Tags = new List<string> {Tag  },
            };
            await RemoteDockerServer.Images.BuildImageFromDockerfileAsync(buildParams, tarStream, null, null, new Progress<JSONMessage>(), CancellationToken.None);
        }
    }
    
}

}

What actually happened?:
The docker image gets built fine but it the tagging gets set as nginx:alpine which is the FROM element within the dockerfile.

What did you expect to happen?:
I would have expected when using docker images ls for it to produce the following output:

testingrepo latest 2b70e4aaac6b 3 months ago 42.6MB

Additional information: