vscode: Extension Debugee does not start when there is a preLaunchTask

Testing #56822

• Open the hello-world extension in VS Code
• Have a watch npm script in package.json

"watch": "tsc -watch -p ./"

• Have the following launch configuration with preLaunchTask to debug the extension

{
    "name": "Launch Extension",
    "type": "extensionHost",
    "request": "launch",
    "runtimeExecutable": "${execPath}",
    "args": [
        "--extensionDevelopmentPath=${workspaceRoot}"
    ],
    "stopOnEntry": false,
    "sourceMaps": true,
    "outFiles": [
        "${workspaceRoot}/out/src/**/*.js"
    ],
    "preLaunchTask": "npm: watch"
}

• Start Debugging “Launch Extension” 🐛 It gets stuck in preLaunchTask

It resumes only when I kill the terminal. See the attached video