Notifyicon creates multiple icons that do not disappear with program shutdown

Question

I have a Windows Form where I use the Notifyicon component.

When running the software the software by Visual Studio and finish running with the stop debug button:

the icon is not removed until I pass the mouse over it:

I’ve tried following the instructions of some stackoverflow questions but none helped me. I’ll leave the title with their links:

Notifyicon remains in Tray Even after application closing but disappears on Mouse Hover

Issue with Notifyicon not disappearing on Winforms App

---

As requested the code for the question:

Code snippet responsible for controlling Notifyicon compounding :

private bool allowVisible;     // ContextMenu's Show command used
private bool allowClose;       // ContextMenu's Exit command used

protected override void SetVisibleCore(bool value)
{
    if (!allowVisible)
    {
        value = false;
        if (!this.IsHandleCreated) CreateHandle();
    }

    UpdateBase(value);
}

private void UpdateBase(bool value)
{
    if (base.InvokeRequired)
    {
        var d = new Action<bool>(UpdateBase);
        base.Invoke(d, new object[] { value });
    }
    else
    {
        base.SetVisibleCore(value);
    }
}

protected override void OnFormClosing(FormClosingEventArgs e)
{
    if (!allowClose)
    {
        this.Hide();
        e.Cancel = true;
    }
    base.OnFormClosing(e);
}

private void showToolStripMenuItem_Click(object sender, EventArgs e)
{
    allowVisible = true;
    Show();
}

private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
    allowClose = true;
    Application.Exit();
}

Other things associated:

private void Form1_FormClosed_1(object sender, FormClosedEventArgs e)
{
    //Outras coisas sendo finalizadas
    notifyIcon1.Visible = false;
    notifyIcon1.Dispose();
}