Modal cannot be ChildContent of EditForm that has EditContext parameter

[rwb196884]

@code {
    [Parameter, EditorRequired]
    public RenderFragment ChildContent { get; set; }

    class ModelClass
    {
        public string Foo { get; set; }
    }

    ModelClass Model { get; set; } = new ModelClass();
    EditContext? EditContext { get; set; }
    ValidationMessageStore? ValidationMessageStore { get; set; }

    protected override void OnParametersSet()
    {
        if (Model == null)
        {
            Model = new ModelClass();
        }
        EditContext = new EditContext(Model);
        ValidationMessageStore = new ValidationMessageStore(EditContext);

        base.OnParametersSet();
    }
}

    <EditForm 
        Model="Model"
    >
@ChildContent
    </EditForm>

Works as expected.

If you replace

 Model="Model"

with

EditContext="EditContext"

then the modal stops working.

[rwb196884]

It's now stopped working with Model="Model" ffs