Rebuild the router after setting the initial workspace workflow states on install.

modules/entity_workflow_workspace/entity_workflow_workspace.install

@@ -48,5 +48,8 @@ function entity_workflow_workspace_install(): void {
     }
 
     $storage->resetCache();
+
+    // Rebuild the router so workflow actions links are correctly assigned.
+    \Drupal::service('router.builder')->setRebuildNeeded();
   }
 }