I have a Blazor WASM application using OIDC authentication (based on this https://docs.microsoft.com/en-us/aspnet/core/blazor/security/webassembly/standalone-with-authentication-library?view=aspnetcore-5.0&tabs=visual-studio). This works fine.

Now, when I add WASM prerendering (based on this https://docs.microsoft.com/en-us/aspnet/core/blazor/security/webassembly/additional-scenarios?view=aspnetcore-5.0#support-prerendering-with-authentication), then it no longer works. I get a strange behavior after the app loads and 404 errors. The redirect after the login then also hits a 404.
In fact, every route is giving a 404... hm...

Here is a small demo video:

This is the demo code:
https://github.com/thinktecture/blazor-webassembly-demo/tree/prerender

.cc @guardrex
dotnet/AspNetCore.Docs#20696