Fixes #11189 - protected content not working (#11193)

* Fixes #11189

* Fixes #11183

* Fix test Null_When_No_Content_On_PublishedRequest.

Believe this is reasonable.

* Update src/Umbraco.Web.Website/Routing/PublicAccessRequestHandler.cs

Co-authored-by: Paul Johnson <pmj@umbraco.com>
Co-authored-by: Bjarke Berg <mail@bergmania.dk>

src/Umbraco.Web.Common/Security/ConfigureMemberCookieOptions.cs

@@ -1,8 +1,10 @@
+using System.Threading.Tasks;
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.Extensions.Options;
 using Umbraco.Cms.Core.Routing;
 using Umbraco.Cms.Core.Services;
+using Umbraco.Extensions;
 
 namespace Umbraco.Cms.Web.Common.Security
 {
@@ -34,6 +36,19 @@ namespace Umbraco.Cms.Web.Common.Security
             options.LogoutPath = null;
 
             options.CookieManager = new MemberCookieManager(_runtimeState, _umbracoRequestPaths);
+
+            options.Events = new CookieAuthenticationEvents
+            {
+                OnSignedIn = ctx =>
+                {
+                    // occurs when sign in is successful and after the ticket is written to the outbound cookie
+
+                    // When we are signed in with the cookie, assign the principal to the current HttpContext
+                    ctx.HttpContext.SetPrincipalForRequest(ctx.Principal);
+
+                    return Task.CompletedTask;
+                }
+            };
         }
     }
 }