aspnetcore: Building in VS from aspnetcore repo, .razor files failing with CS0649 (Field is never assigned to) and RZ9991 (Attribute names could not be inferred)

This seems to be a new issue since yesterday, as far as I can tell. Note that it works fine when building from the command line.

Repro: Open ComponentsNoDeps.slnf in Visual Studio and try to build BasicTestApp

2>------ Build started: Project: BasicTestApp, Configuration: Debug Any CPU ------
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\FormsTest\InputFileComponent.razor(8,170,8,182): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\FormsTest\InputFileComponent.razor(13,283,13,299): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\VirtualizationComponent.razor(3,87,3,95): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\GlobalizationBindCases.razor(15,640,15,660): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\GlobalizationBindCases.razor(27,1126,27,1153): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\GlobalizationBindCases.razor(39,1612,39,1634): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\GlobalizationBindCases.razor(52,2217,52,2244): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(22,1131,22,1161): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(24,1366,24,1396): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(37,1894,37,1917): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(67,3213,67,3230): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(91,4297,91,4316): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(136,6411,136,6439): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(166,8113,166,8139): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(178,8819,178,8852): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(283,14378,283,14419): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(297,15089,297,15122): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(311,15740,311,15772): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\BindCasesComponent.razor(325,16455,325,16491): error RZ9991: The attribute names could not be inferred from bind attribute 'bind-value'. Bind attributes should be of the form 'bind' or 'bind-value' along with their corresponding optional parameters like 'bind-value:event', 'bind:format' etc.
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\SignalRClientComponent.razor(31,31,31,44): error CS0649: Field 'SignalRClientComponent.transportType' is never assigned to, and will always have its default value
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\MultipleChildContent.razor(24,10,24,20): error CS0649: Field 'MultipleChildContent.ShowFooter' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\EventCustomArgsComponent.razor(80,10,80,38): error CS0649: Field 'EventCustomArgsComponent.customKeyDownStopPropagation' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\EventBubblingComponent.razor(81,10,81,31): error CS0649: Field 'EventBubblingComponent.targetStopPropagation' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\EventBubblingComponent.razor(83,10,83,26): error CS0649: Field 'EventBubblingComponent.preventOnKeyDown' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\HttpClientTest\CookieCounterComponent.razor(19,12,19,29): error CS0649: Field 'CookieCounterComponent.testServerBaseUrl' is never assigned to, and will always have its default value null
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\EventBubblingComponent.razor(80,10,80,37): error CS0649: Field 'EventBubblingComponent.intermediateStopPropagation' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\EventBubblingComponent.razor(82,10,82,32): error CS0649: Field 'EventBubblingComponent.ancestorPreventDefault' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\CascadingValueTest\CascadingValueSupplier.razor(26,10,26,27): error CS0649: Field 'CascadingValueSupplier.currentFlagValue2' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\RouterTest\PreventDefaultCases.razor(36,10,36,30): error CS0649: Field 'PreventDefaultCases.targetPreventDefault' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\CascadingValueTest\CascadingValueSupplier.razor(25,10,25,27): error CS0649: Field 'CascadingValueSupplier.currentFlagValue1' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\RouterTest\PreventDefaultCases.razor(37,10,37,34): error CS0649: Field 'PreventDefaultCases.descendantPreventDefault' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\DynamicComponentRendering.razor(31,20,31,35): error CS0649: Field 'DynamicComponentRendering.currentCaseName' is never assigned to, and will always have its default value null
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\SignalRClientComponent.razor(30,20,30,26): error CS0649: Field 'SignalRClientComponent.hubUrl' is never assigned to, and will always have its default value null
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\EventCustomArgsComponent.razor(79,10,79,37): error CS0649: Field 'EventCustomArgsComponent.customKeyDownPreventDefault' is never assigned to, and will always have its default value false
2>C:\dir\aspnetcore\src\Components\test\testassets\BasicTestApp\RouterTest\PreventDefaultCases.razor(35,10,35,32): error CS0649: Field 'PreventDefaultCases.ancestorPreventDefault' is never assigned to, and will always have its default value false
2>Done building project "BasicTestApp.csproj" -- FAILED.
========== Build: 1 succeeded, 1 failed, 6 up-to-date, 0 skipped ==========

This happens in other sample projects too if I add a [Parameter] property.

I’m unsure why this would only affect building inside VS and not the command line. Might it be something to do with source generator changes? I tried the following VS versions:

• 16.10.0 Preview 1.0
• 16.10.0 Preview 2.0 [31117.304.main]

… with the same results on both.