"No build task to run found" for ".vscode/tasks.json", but tasks on "workspace.json" works

I'm running vscode in windows 10 x64, using sshfs extension to connect a Raspberry Pi Zero W (armv6l, not supported by Microsoft's Remote SSH) running "Raspberry Pi OS". To connect, I use the following config:

    "sshfs.configs": [
        {
            "name": "myproject",
            "host": "raspberrypi",
            "root": "/home/pi/git/myproject",
            "username": "pi",
            "privateKeyPath": "c:\\users\\myuser\\.ssh\\id_rsa"
        }
   ]

When clicking on Add as Workspace folder button, the project is loaded correctly, the project folder is opened by vscode and the myproject/.vscode/tasks.json file is present.

Then I press ctrl+shift+b to build but vscode shows the No build task to run found. Configure Build Task... message.

If I press ctrl+shift+p, select Preferences: Open Workspace Settings (JSON) and add the task there (like below sample), then it gets listed when pressing ctrl+shift+b and everything works fine.

{
    "folders": [
        {
            "name": "SSH FS - myproject",
            "uri": "ssh://myproject/"
        }
    ],
    "settings": {},
    "tasks": {
        "version": "2.0.0",
        "tasks": [
            {
                "label": "SSH FS: myproject build && run",
                "group": "build",
                "type": "ssh-shell",
                "host": "myproject",
                "options": {
                    "cwd": "${remoteWorkspaceFolder}"
                },
                "command": "g++ -g ./sample.cpp -o sample && ./sample",
                "problemMatcher": [],
                "presentation": {
                    "reveal": "always",
                    "showReuseMessage": false,
                    "panel": "shared",
                    "clear": true
                }
            }
        ]
    }
}

The task from tasks.json file got listed randomly a couple times (and worked fine), but as soon I closed vscode and reopened (or just disconnect and reconnect sshfs), it's gone again.

SchoofsKelvin / vscode-sshfs

"No build task to run found" for ".vscode/tasks.json", but tasks on "workspace.json" works #263