.NET 8 Preview 4 - Blazor WASM - Hot Reload broken with dotnet watch

[JeepNL]

Describe the bug

• Static Blazor WASM client.
• .NET 8 preview 4

Hot Reload isn't usable anymore.

After every (saved) change in a .razor page the dotnet watch cli reports the following error:

dotnet watch ⌚ File changed: .\Pages\Txt2Img.razor.
dotnet watch ⌚ C:\X\Repos\Tusk\ClientTusk\Program.cs(10,28): error CS0246: The type or namespace name 'App' could not be found (are you missing a using directive or an assembly reference?)
dotnet watch ⌚ Found compilation errors during hot reload. Reporting it in application UI.

If you do CTRL-R (restart) everything works again. Without an additional change.

[MarkusRodler]

I can confirm the exact same bug

[0xakihiko]

Same issue here.

edit: As a test, I rolled back to preview 3 along with my nuget packages and had no issues.

[JoeRobich]

dotnet-format is also failing to properly load a blazorwasm project using .NET 8 preview 4. MSBuildWorkspace is producing the same errors as dotnet-watch (see dotnet/format#1866 (comment))

[tmat]

Based on @JoeRobich's comment this doesn't look like dotnet-watch bug.

[tmat]

@mkArtak

[tmat]

Moved to blazor-wasm for investigation.

[Alexr03]

I am getting the same issue with a blazor WASM app, however not running .NET 8 previews. I am using .NET 7

dotnet --version
7.0.203

[mrakgr]

Let me just confirm this. I ran into this bug a couple of days ago and had to go back to a previous version.