Task json "Operating system specific properties" is broken #11601

{
    "tasks": [
        {
            "type": "cppbuild",
            "label": "C/C++: g++.exe build active file",
            "command": "g++",
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "Task generated by Debugger.",
            "windows": {
                "args": [
                    "-fdiagnostics-color=always",
                    "-g",
                    "--std=c++20",
                    "-Wall",
                    "-Wextra",
                    "-DDEBUG",
                    "${file}",
                    "-o",
                    "${fileDirname}/${fileBasenameNoExtension}.exe"
                ],
            },
            "linux": {
                "args": [
                    "-fdiagnostics-color=always",
                    "-g",
                    "--std=c++20",
                    "-Wall",
                    "-Wextra",
                    "-DDEBUG",
                    "${file}",
                    "-o",
                    "${fileDirname}/${fileBasenameNoExtension}.out"
                ],
            },
        }
    ],
    "version": "2.0.0"
}