No stdout from remote target when debugging over a "target remote" pipe

Type: Debugger
gdb

• OS and Version: ubuntu 18.04 LTS
• VS Code Version: 1.41.1
• C/C++ Extension Version: 0.26.3

I don't know if it's the same as:
https://github.com/Microsoft/vscode-cpptools/issues/827

But as the issue was 2.5 years old I open a new one.

I'm unable to see gdbserver's output. The output is sent back to VSCode, so it's a parsing error.

I'm running my application through a "target remote" pipe in "customLaunchSetupCommands", as the docker container has no connectivity and I don't own the container. The relevant parts of my configuration:

"customLaunchSetupCommands": [
      {
        "description": "Pipe launch gdbserver",
        "text": "target remote | docker exec -i <container> gdbserver - ${workspaceFolder}/<app>",
        "ignoreFailures": false
      },
      {
        "description": "Some apps include relative dirs",
        "text": "cd ${workspaceFolder}",
        "ignoreFailures": false
      },
      {
        "description": "Stop at main",
        "text": "b main",
        "ignoreFailures": false
      }
    ],

I have logging enabled:

"logging": {
    "trace": true,
     "traceResponse": true,
     "engineLogging": true
},

I see in the logs that gdbserver is generating the output, it's just that it's not correctly parsed.e.g:

--> E (output): {"type":"event","event":"output","body":{"category":"console","output":"1: (23145) ->&\" 4 FAILED TESTS\\n\"\n"},"seq":803}
1: (23145) ->&" 4 FAILED TESTS\n"