Razor Components bound textarea not working properly without WebSocket

[wanton7]

Describe the bug

If you disable WebSocket for BlazorHub then textarea that uses bind, then textarea starts reverting to earlier text while you are writing to it.
I wanted to test Razor Components with higher latency so I wanted to disable WebSocket so browsers throttling will work.

To Reproduce

@page "/oddness"

<textarea style="width:100%;resize:vertical" rows="5" bind-value-oninput="@Text"></textarea>
<div>@Text</div>

@functions {
    string Text { get; set; }
}

Then instead of app.UseServerSideBlazor<App.Startup>(); use

app.UseSignalR(route => route.MapHub<BlazorHub>(BlazorHub.DefaultPath, opts => opts.Transports &= ~Microsoft.AspNetCore.Http.Connections.HttpTransportType.WebSockets));
app.UseBlazor<App.Startup>();

If you apply browser throttling (added latency) it will get much worse.

Expected behavior

That textarea would work normally

Additional context

I used these NuGets

<PackageReference Include="Microsoft.AspNetCore.Components.Browser" Version="0.8.0-preview1-20181126.4" />
<PackageReference Include="Microsoft.AspNetCore.Components.Build" Version="0.8.0-preview1-20181126.4" PrivateAssets="all" />

[mkArtakMSFT]

Thanks for contacting us, @wanton7.
We believe this is dupe of #8204.