RZ10020 error after upgrading to Visual Studio 17.6

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

After upgrading to Visual Studio 17.6, with dotnet 7 SDK at 7.0.302, we are seeing the following Razor errors when using @bind-Value:get

RZ10020 Attribute 'bind-Value:get' can only be used with RazorLanguageVersion 7.0 or higher

Expected Behavior

No errors reported.

Steps To Reproduce

No response

Exceptions (if any)

RZ10020 Attribute ‘bind-Value:get’ can only be used with RazorLanguageVersion 7.0 or higher

.NET Version

7.0.302

Anything else?

No response

[djbaldwin]

This issue remains in VS 17.6.4.

In a new Blazor Server project, replace index.razor with this code. The error list indicates 6 errors, however the project still runs.

@page "/"

<PageTitle>Index</PageTitle>
<h1>Bind Get Set Examples</h1>

<h2>Elements</h2>

<input type="text" @bind:get="text" @bind:set="(value) => { text = value; }" />
<input type="text" @bind:get="text" @bind:set="Set" />
<input type="text" @bind:get="text" @bind:set="SetAsync" />

<h2>Components</h2>

<InputText @bind-Value:get="text" @bind-Value:set="(value) => { text = value; }" />
<InputText @bind-Value:get="text" @bind-Value:set="Set" />
<InputText @bind-Value:get="text" @bind-Value:set="SetAsync" />

@code {
    private string text = "";

    private void Set(string value)
    {
        text = value;
    }

    private Task SetAsync(string value)
    {
        text = value;
        return Task.CompletedTask;
    }
}

[ryanbuening]

I updated to VS 17.6.3 and .NET 7.0.304, but this issue still remains. Was this intended to be fixed in those updates?