vscode: pipeTransport.pipeArgs command variable replacement not working

Attempting to figure out why input and command replacements do not work for launch.json pipeTransport.pipeArgs (used in omnisharp-csharp extension). My use case requires omnisharp-vscode extension. However, this involves the vscode variable replacement logic, so I am posting it here.

• VSCode Version: 1.41.1 (also tried insider 1.42.0-insider)
• OS Version: Darwin x64 18.7.0

Steps to Reproduce:

1. Create a launch.json for remote debugging a csharp docker container. (e.g. vsdbg)

My Use Case Example (requires vscode-docker extension)

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": ".NET Core Docker Attach",
            "type": "coreclr",
            "request": "attach",
            "pipeTransport": {
                "pipeProgram": "docker",
                "pipeArgs": [
                    "exec", "-i", "${command:vscode-docker.containers.select}"
                ],
                "debuggerPath": "/root/vsdbg/vsdbg",
                "pipeCwd": "${workspaceRoot}",
                "quoteArgs": false
            },
            "processId": "${command:pickRemoteProcess}",
            "sourceFileMap": {
                "/app": "${workspaceRoot}"
            },
            "justMyCode": true
        }
    ]
}

vscode-docker.containers.select reference: https://github.com/microsoft/vscode-docker/pull/1240

Another Example

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": ".NET Core Docker Attach",
            "type": "coreclr",
            "request": "attach",
            "pipeTransport": {
                "pipeProgram": "docker",
                "pipeArgs": [
                    "exec", "-i", "${input:sampleInput}"
                ],
                "debuggerPath": "/root/vsdbg/vsdbg",
                "pipeCwd": "${workspaceRoot}",
                "quoteArgs": false
            },
            "processId": "${command:pickRemoteProcess}",
            "sourceFileMap": {
                "/app": "${workspaceRoot}"
            },
            "justMyCode": true
        }
    ],
    "inputs": [
        {
            "id": "sampleInput",
            "type": "promptString",
            "description": "issue example"
        }
    ]
}

1. It will display the vscode prompts and dialogs, but not actually replace the entered/command value into the string for either example.

Output

Executing: docker exec -i ${input:sampleInput} sh -s < /Users/user/.vscode/extensions/ms-vscode.csharp-1.21.9/scripts/remoteProcessPickerScript
stderr: "docker exec" requires at least 2 arguments.
...

Does this issue occur when all extensions are disabled?: Not Sure.