BUGFIX: neos#4909 fix subrequest on show action

> Could not resolve a route and its corresponding URI for the given parameters.

Neos.Neos/Classes/FrontendRouting/EventSourcedFrontendNodeRoutePartHandler.php

@@ -265,6 +265,15 @@ public function resolveWithParameters(array &$routeValues, RouteParameters $para
         $currentRequestSiteDetectionResult = SiteDetectionResult::fromRouteParameters($parameters);
 
         $nodeAddress = $routeValues[$this->name];
+
+        if (is_string($nodeAddress)) {
+            try {
+                $nodeAddress = NodeAddress::fromJsonString($nodeAddress);
+            } catch (\InvalidArgumentException) {
+                return false;
+            }
+        }
+
         if (!$nodeAddress instanceof NodeAddress) {
             return false;
         }