diff --git a/backend/src/app/http/debug.clj b/backend/src/app/http/debug.clj
index 6995464290..145737280a 100644
--- a/backend/src/app/http/debug.clj
+++ b/backend/src/app/http/debug.clj
@@ -784,8 +784,12 @@
 
     (db/tx-run! (assoc cfg ::db/rollback true)
                 (fn [cfg]
-                  (let [file (bfc/get-file cfg file-id)
-                        libs (bfc/get-resolved-file-libraries cfg file-id)]
+                  ;; Validation walks every page and component, so the
+                  ;; file is read realized; the library map is built
+                  ;; from the file (not its id) and its own loader
+                  ;; resolves each library's pointers.
+                  (let [file (bfc/get-file cfg file-id :realize? true)
+                        libs (bfc/get-resolved-file-libraries cfg file)]
                     (if file
                       (let [errors (cfv/validate-file file libs)]
                         {::yres/status  200
diff --git a/backend/test/backend_tests/http_debug_test.clj b/backend/test/backend_tests/http_debug_test.clj
new file mode 100644
index 0000000000..9c874601f4
--- /dev/null
+++ b/backend/test/backend_tests/http_debug_test.clj
@@ -0,0 +1,29 @@
+;; This Source Code Form is subject to the terms of the Mozilla Public
+;; License, v. 2.0. If a copy of the MPL was not distributed with this
+;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+;;
+;; Copyright (c) KALEIDOS SUBSIDIARY SL
+
+(ns backend-tests.http-debug-test
+  "The /dbg validate action walks the whole file and its libraries: it
+  must hand `get-resolved-file-libraries` the file (not its id) and
+  resolve the pointer-mapped pages with the file's own loader."
+  (:require
+   [app.http.debug :as debug]
+   [backend-tests.helpers :as th]
+   [clojure.test :as t]
+   [yetti.response :as-alias yres]))
+
+(t/use-fixtures :once th/state-init)
+(t/use-fixtures :each th/database-reset)
+
+(t/deftest validate-file-action-resolves-pointer-mapped-data
+  (let [profile (th/create-profile* 1)
+        file    (th/create-file* 1 {:profile-id (:id profile)
+                                    :project-id (:default-project-id profile)
+                                    :is-shared false})
+        handler (deref #'debug/validate-file)
+        result  (handler th/*system* {:params {:file-id (str (:id file))}})]
+
+    (t/is (= 200 (::yres/status result)))
+    (t/is (= "NO VALIDATION ERRORS FOUND" (::yres/body result)))))