.NET9 upgrade breaks login

[adamfoneil]

See this issue
dotnet/aspnetcore#58967

I tried upgrading all projects to .NET9, and this line started failing. I tried ignoring the error, but this meant the user is left on the login page after successful login. You can manually click on the home page, but that behavior is not acceptable. Redirect should work.

Main issue being tracked
dotnet/aspnetcore#59451

[burrowj]

Same here. Going to 9 broke it, going back to 8