fix tests

Author: javiercn

src/Components/Components/src/NavigationManager.cs

@@ -259,7 +259,7 @@ internal ReadOnlySpan<char> ToBaseRelativePath(ReadOnlySpan<char> uri)
             // whether the server would return the same page whether or not the
             // slash is present, but ASP.NET Core at least does by default when
             // using PathBase.
-            return uri[..(_baseUri.OriginalString.Length - 1)];
+            return uri[(_baseUri.OriginalString.Length - 1)..];
         }
 
         var message = $"The URI '{uri}' is not contained by the base URI '{_baseUri}'.";

src/Components/Endpoints/src/RazorComponentEndpointInvoker.cs

@@ -138,6 +138,7 @@ private async Task<RequestValidationState> ValidateRequestAsync(HttpContext cont
                 }
                 else
                 {
+                    valid = true;
                     Log.MiddlewareAntiforgeryValidationSucceeded(_logger);
                 }
             }