When does a blazor component render?

In the diagram below from this page it shows that when an incomplete task is returned by the call to OnInitializedAsync it will await the task and then render the component.

However it seems that what actual happens when an incomplete task is returned is renders the component immediately, and then renders it again once the incomplete task completes.

An example later in the page seems to confirm this. If the component was not rendered immediately after the call to OnInitializedAsync, and instead only rendered for the first time after the Task returned had been completed you would never see the "Loading..." message.

OnParametersSetAsync behavior appears the same. It renders once immediately when an incomplete task is returned, and then again once that task has completed.

Am I misunderstanding the render lifecycle, or is this an error in the documentation?

Thanks

@page "/fetchdata"@using BlazorSample.Data@inject WeatherForecastService ForecastService<h1>Weather forecast</h1><p>This component demonstrates fetching data from a service.</p>@if (forecasts == null){<p><em>Loading...</em></p>}else{<table class="table"><!-- forecast data in table element content --></table>}@code {    private WeatherForecast[]? forecasts;    protected override async Task OnInitializedAsync()    {        forecasts = await ForecastService.GetForecastAsync(DateTime.Now);    }}