Blazor "bind" has been broken in preview 6 daily builds since May 30

[glent1]

Describe the bug

Binding using the "bind" keyword has been broken in the preview 6 daily builds since May 30. Using the @bind syntax works, but I can't find anything suggesting this should be the case

To Reproduce

Using current preview 6 daily (as below)
dotnet new blazorserverside
edit counter.razor as follows ...

@page "/counter"
<input type="text" @bind=A /><br/>
<input type="text" bind="@B" /><br/>
<input type="text" value="@C" /><br/>

Current value of A is @A <br/>
Current value of B is @B <br/>
Current value of C is @C <br/>
@code {
    string A="A";
    string B="B";
    string C="C";
}

dotnet run
navigate to counter page
change the values of the three textboxes

Expected behavior

strings A B and C all get updated when the bound textbox is updated

Actual behavior

Only A (the @Bind syntax) works correctly

Additional context

dotnet --info
.NET Core SDK (reflecting any global.json):
Version: 3.0.100-preview6-012135
Commit: 19761f8a5c

Runtime Environment:
OS Name: Windows
OS Version: 10.0.18362
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\3.0.100-preview6-012135\

Host (useful for support):
Version: 3.0.0-preview6-27730-01
Commit: 63abc77da6

.NET Core SDKs installed:
3.0.100-preview6-012135 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.0.0-preview6-19279-08 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.0.0-preview6-27729-07 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.0.0-preview6-27730-01 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.0.0-preview6-27730-01 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

[rynowak]

Hi @glent1 - this is part of the directive attributes work that's shipping in 3.0 preview 6 / VS 16.2-preview 2. You can read more about this here #6364

Thanks for reaching out, this was a good reminder to me to update the issue with more details.

[glent1]

Excellent - thanks for taking the time to reply. I guess if I'd known that they were called "directives", I'd have had more luck searching for the change!

[rynowak]

No worries, we made up the term to explain the new feature!