Blazor overwritten parameters with two-way binding

[peerpalo]

I've got a simple component with a two-way binding parameter, e.g.

private bool collapsed;

[Parameter]
public bool Collapsed
{
    get => collapsed;
    set
    {
        if (value != collapsed)
        {
            collapsed = value;
            CollapsedChanged.InvokeAsync(value);
        }
    }
}

[Parameter]
public EventCallback<bool> CollapsedChanged { get; set; }

but if I use it as a simple property everytime that the state is changed the value is reset to the initial one written inside razor markup.

It is easily reproducible in this fiddle: https://blazorfiddle.com/s/18mp08rq

I understand that this problem has been already addressed and solved in docs and even in #20405 but in this case I want to use it both as a property or two-way binding and I don't see any solution.

If I use the private property I cannot raise EventCallback when it's changed and @bind-Collapsed won't work