Blazor WASM, Web App(Auto,WASM) Repeatedly Re-renders in Debug Mode When Using WebAssembly.instantiateStreaming via Web Worker

[GokulprasathVenkatachalam]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

When running Visual Studio 2022 (v17.13.6) in administrator mode, loading a simple.wasm file in a Blazor WebAssembly application through a Web Worker using WebAssembly.instantiateStreaming results in the page continuously re-rendering when the application is executed in debug mode with a breakpoint set.

Expected Behavior

The application should pause at the breakpoint and continue executing as normal after resuming.

Steps To Reproduce

• Open Visual Studio 2022 (v17.13.6) in administrator mode.

• Load a Blazor WebAssembly application that uses a Web Worker to instantiate a .wasm file via WebAssembly.instantiateStreaming.

• Set a breakpoint in the Home.razor file code.

• Run the application in debug mode.

Exceptions (if any)

No response

.NET Version

9.0.203

Anything else?

Issue Video Reference: Continuously re-rendering.mp4

Sample: Sample.zip

[dotnet-policy-service]

Tagging subscribers to this area: @thaystg
See info in area-owners.md if you want to be subscribed.

[lewing]

Does this only happen in administrator mode?

[GokulprasathVenkatachalam]

Hi @lewing,
Yes, the issue occurs only in administrator mode.

[lewing]

I suspect the underlying cause here is the browser enabling more protections when run as administrator which are failing to correctly load the runtime.