Container does not receive stdin input

[bhaeussermann]

When I start a container and attach to its input stream, the container does not receive the bytes written to the stream.

Output of dotnet --info:

.NET SDK:
 Version:           8.0.100
 Commit:            57efcf1350
 Workload version:  8.0.100-manifests.8d38d0cc

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19045
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\8.0.100\

What version of Docker.DotNet?:

3.125.15

Steps to reproduce the issue:

1. This is my test program (Program.cs) for the container:

using var input = Console.OpenStandardInput();
byte[] buffer = new byte[100];
int bytesCount = input.Read(buffer, 0, buffer.Length);
Console.WriteLine($"Received {bytesCount} bytes.");

(The test program is attached to this issue.)

2. Here is the Dockerfile I'm using to build the Linux image:

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
COPY Read.csproj src/Read.csproj
COPY Program.cs src/Program.cs
RUN dotnet publish --output out src

FROM mcr.microsoft.com/dotnet/runtime:6.0 AS final
WORKDIR /app
COPY --from=build out .
ENTRYPOINT ["dotnet", "Read.dll"]

3. Build the image using the following command:

docker build -t read .

4. I run the following code to start a container and write to its stdin stream:

using Docker.DotNet;
using Docker.DotNet.Models;
using System.Text;

using var client = new DockerClientConfiguration().CreateClient();
var response = await client.Containers.CreateContainerAsync(new CreateContainerParameters
{
    Image = "read:latest",
    AttachStdin = true,
    // When I set this flag the container never finishes running and the call to WaitContainerAsync() times out.
    // OpenStdin = true,
    StdinOnce = true
});

await client.Containers.StartContainerAsync(response.ID, new ContainerStartParameters());

using (var inputStream = await client.Containers.AttachContainerAsync(response.ID, tty: false, new()
{
    Stream = true,
    Stdin = true
}))
{
    byte[] bytes = Encoding.UTF8.GetBytes($"Hello{Environment.NewLine}Bye{Environment.NewLine}");
    await inputStream.WriteAsync(bytes, 0, bytes.Length, CancellationToken.None);
    inputStream.CloseWrite();
}

var cancellationTokenSource = new CancellationTokenSource();
cancellationTokenSource.CancelAfter(TimeSpan.FromSeconds(10));
await client.Containers.WaitContainerAsync(response.ID, cancellationTokenSource.Token);

var logs = await client.Containers.GetContainerLogsAsync(response.ID, tty: false, new()
{
    ShowStdout = true,
    ShowStderr = true
});
var (stdOut, stdError) = await logs.ReadOutputToEndAsync(CancellationToken.None);
Console.WriteLine($"Output: [{string.Concat(stdOut, stdError)}]");

What actually happened?: The container outputs Received 0 bytes. indicating that it's not receiving the input.

As mentioned in the code comment above, if I set OpenStdin = true on the CreateContainerParameters when creating the container, the container freezes. In particular, by adding some file logging, I can determine that it freezes at the int bytesCount = input.Read(buffer, 0, buffer.Length); line.

What did you expect to happen?:

The container must output Received 12 bytes.

Additional information: Read.zip