Ensure that route altering runs after workspaces_ui.

modules/entity_workflow_workspace/src/Routing/RouteSubscriber.php

@@ -3,6 +3,7 @@
 namespace Drupal\entity_workflow_workspace\Routing;
 
 use Drupal\Core\Routing\RouteSubscriberBase;
+use Drupal\Core\Routing\RoutingEvents;
 use Symfony\Component\Routing\RouteCollection;
 
 /**
@@ -16,7 +17,7 @@ class RouteSubscriber extends RouteSubscriberBase {
   /**
    * {@inheritdoc}
    */
-  protected function alterRoutes(RouteCollection $collection) {
+  protected function alterRoutes(RouteCollection $collection): void {
     // Disallow access the generic 'Publish' and 'Revert' routes, these actions
     // are done with workflow transitions.
     if ($route = $collection->get('entity.workspace.publish_form')) {
@@ -27,4 +28,14 @@ class RouteSubscriber extends RouteSubscriberBase {
     }
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents(): array {
+    $events = parent::getSubscribedEvents();
+    // Run after \Drupal\workspaces_ui\Routing\RouteSubscriber.
+    $events[RoutingEvents::ALTER] = ['onAlterRoutes', -100];
+    return $events;
+  }
+
 }