Mouse filter : Stop doesn't work or the input still propagates if _Input() is called.

Question

I have a problem with mouse filter Stop. It doesn't seem to work if _Input() is called

https://drive.google.com/file/d/1X2cteq82lLYTMqsznX9I11xc71_nTjzo/view

the spatial node has this script attach to it

public override void _UnhandledInput( InputEvent @event )
{
    base._UnhandledInput(@event);

    if ( @event is InputEventMouseButton inputEvent )
    {
        if ( inputEvent.ButtonIndex == (int)ButtonList.Left && inputEvent.Pressed )
        {
            GD.Print("TESt");
        }
    }

}

The Stop filter works if i use UnhandledInput but once i changed it to just Input() or just use Input.IsActionJustPressed("left_mouse") inside the process() function the panel node doesn't stop the propagation.