Hot Reload: Adding a code block at runtime does not get hot reloaded, even refreshing the browser doesn't show the change.

[MacdonaldRobinson]

Describe the bug

Hot Reload: Adding a code block at runtime does not get hot reloaded, even refreshing the browser doesn't show the change.

To Reproduce

• In WSL - Ubuntu 20.04 LTS
• Create a new web app using "dotnet new blazorwasm"
• Use "code ." to open it in VS Code
• In the Terminal type "dotnet watch"
• Open the link in the browser
• Open Pages/Index.razor
• Add a new code block and create a new property like "color"
• Now create a new line outside the code block to display this property value
• Now save the file
• You will notice in the console that the change IS detected however you get the message: "No hot reload changes to apply"
• Force refresh the browser and you will still not see your change
• CTRL + SHIFT + R does not work for some reason so you will need to stop and restart the app
• You will now see your changes

Expectation

Code block changes are applied via hot reload

Output of dotnet --info

.NET SDK (reflecting any global.json):
Version: 6.0.100-preview.6.21355.2
Commit: 7f8e0d76c0

Runtime Environment:
OS Name: ubuntu
OS Version: 20.04
OS Platform: Linux
RID: ubuntu.20.04-x64
Base Path: /home/mac/dotnet/sdk/6.0.100-preview.6.21355.2/

Host (useful for support):
Version: 6.0.0-preview.6.21352.12
Commit: 770d630b28

.NET SDKs installed:
6.0.100-preview.6.21355.2 [/home/mac/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.0-preview.6.21355.2 [/home/mac/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.0-preview.6.21352.12 [/home/mac/dotnet/shared/Microsoft.NETCore.App]

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

[pranavkm]

Thanks for the issue report @MacdonaldRobinson. For 6.0, adding a field is a rude edit with the WebAssembly runtime and requires a full rebuild. We were previously handling this incorrectly and suppressing the error the runtime would throw which explained some of the weird behavior you were seeing here. With a more recent SDK, dotnet-watch produces a rude edit when you make this change.

We are using dotnet/runtime#57365 to support more kinds of edits in the Mono runtime for 7.0.