diff --git a/common/src/app/common/types/plugins.cljc b/common/src/app/common/types/plugins.cljc
index 1be3578cc1..7fe8a4c7d4 100644
--- a/common/src/app/common/types/plugins.cljc
+++ b/common/src/app/common/types/plugins.cljc
@@ -30,6 +30,7 @@
 (def schema:registry-entry
   [:map
    [:plugin-id :string]
+   [:version {:optional true} :int]
    [:name :string]
    [:description {:optional true} :string]
    [:host :string]
diff --git a/frontend/src/app/main/data/plugins.cljs b/frontend/src/app/main/data/plugins.cljs
index 77f5d55013..6635fc070b 100644
--- a/frontend/src/app/main/data/plugins.cljs
+++ b/frontend/src/app/main/data/plugins.cljs
@@ -82,7 +82,7 @@
 
 (defn- load-plugin!
   [{:keys [plugin-id name version description host code icon permissions]}]
-  (st/emit! (pflag/clear plugin-id)
+  (st/emit! (pflag/initialize plugin-id version)
             (save-current-plugin plugin-id))
 
   (let [load-plugin (unchecked-get ug/global "ɵloadPlugin")]
diff --git a/frontend/src/app/plugins/flags.cljs b/frontend/src/app/plugins/flags.cljs
index ef0ca57ab6..b804df4d9c 100644
--- a/frontend/src/app/plugins/flags.cljs
+++ b/frontend/src/app/plugins/flags.cljs
@@ -6,17 +6,24 @@
 
 (ns app.plugins.flags
   (:require
+   [app.common.data :as d]
    [app.main.store :as st]
    [app.plugins.utils :as u]
    [app.util.object :as obj]
    [potok.v2.core :as ptk]))
 
-(defn clear
-  [id]
-  (ptk/reify ::reset
+(defn initialize
+  "Initialize flags values for plugins"
+  [id version]
+  (ptk/reify ::initialize
     ptk/UpdateEvent
     (update [_ state]
-      (update-in state [:plugins :flags] assoc id {}))))
+      (let [version (d/nilv version 1)]
+        (update-in state [:plugins :flags] assoc id
+                   {:natural-child-ordering false
+                    ;; For version >= 2 harden the contract by throwing errors
+                    ;; on validation failures
+                    :throw-validation-errors (>= version 2)})))))
 
 (defn- set-flag
   [id key value]
diff --git a/frontend/src/app/plugins/utils.cljs b/frontend/src/app/plugins/utils.cljs
index e08e792ada..2e0db5d324 100644
--- a/frontend/src/app/plugins/utils.cljs
+++ b/frontend/src/app/plugins/utils.cljs
@@ -323,14 +323,27 @@
    message to the console."
   [plugin-id]
   (fn [cause]
-    (let [message
-          (if-let [explain (-> cause ex-data ::sm/explain)]
-            (do
-              (js/console.error (sm/humanize-explain explain))
-              (error-messages explain))
-            (ex-data cause))]
-      (js/console.log (.-stack cause))
-      (not-valid plugin-id :error message))))
+    (let [explain (-> cause ex-data ::sm/explain)
+          throw? (throw-validation-errors? plugin-id)]
+      (cond
+        ;; If it's a clojure error we throw as a validation error
+        (and throw? explain)
+        (throw-not-valid :error (error-messages explain))
+
+        ;; Unexpected errors we just propagate them
+        throw?
+        (throw cause)
+
+        ;; If not throw is active we log the caught error
+        :else
+        (let [message
+              (if explain
+                (do
+                  (js/console.error (sm/humanize-explain explain))
+                  (error-messages explain))
+                (ex-data cause))]
+          (js/console.log (.-stack cause))
+          (not-valid plugin-id :error message))))))
 
 (defn is-main-component-proxy?
   [p]
diff --git a/frontend/test/frontend_tests/plugins/context_shapes_test.cljs b/frontend/test/frontend_tests/plugins/context_shapes_test.cljs
index dd1a7e3634..0bba39cd40 100644
--- a/frontend/test/frontend_tests/plugins/context_shapes_test.cljs
+++ b/frontend/test/frontend_tests/plugins/context_shapes_test.cljs
@@ -14,7 +14,8 @@
    [app.util.object :as obj]
    [cljs.test :as t :include-macros true]
    [frontend-tests.helpers.state :as ths]
-   [frontend-tests.helpers.wasm :as thw]))
+   [frontend-tests.helpers.wasm :as thw]
+   [potok.v2.core :as ptk]))
 
 (t/deftest test-common-shape-properties
   (thw/with-wasm-mocks*
@@ -25,6 +26,7 @@
             ^js context (api/create-context "00000000-0000-0000-0000-000000000000")
 
             _       (set! st/state store)
+            _       (ptk/emit! store #(assoc-in % [:plugins :flags "00000000-0000-0000-0000-000000000000" :throw-validation-errors] true))
 
             ^js file    (. context -currentFile)
             ^js page    (. context -currentPage)
@@ -65,7 +67,7 @@
             (t/is (= (.-x shape) 10))
             (t/is (= (get-in @store (get-shape-path :x)) 10))
 
-            (set! (.-x shape) "fail")
+            (t/is (thrown? js/Error (set! (.-x shape) "fail")))
             (t/is (= (.-x shape) 10))
             (t/is (= (get-in @store (get-shape-path :x)) 10)))
 
@@ -74,7 +76,7 @@
             (t/is (= (.-y shape) 50))
             (t/is (= (get-in @store (get-shape-path :y)) 50))
 
-            (set! (.-y shape) "fail")
+            (t/is (thrown? js/Error (set! (.-y shape) "fail")))
             (t/is (= (.-y shape) 50))
             (t/is (= (get-in @store (get-shape-path :y)) 50)))
 
@@ -85,7 +87,7 @@
             (t/is (= (get-in @store (get-shape-path :width)) 250))
             (t/is (= (get-in @store (get-shape-path :height)) 300))
 
-            (.resize shape 0 0)
+            (t/is (thrown? js/Error (.resize shape 0 0)))
             (t/is (= (.-width shape) 250))
             (t/is (= (.-height shape) 300))
             (t/is (= (get-in @store (get-shape-path :width)) 250))
@@ -115,7 +117,7 @@
             (t/is (= (get-in @store (get-shape-path :proportion-lock)) true)))
 
           (t/testing " - constraintsHorizontal"
-            (set! (.-constraintsHorizontal shape) "fail")
+            (t/is (thrown? js/Error (set! (.-constraintsHorizontal shape) "fail")))
             (t/is (not= (.-constraintsHorizontal shape) "fail"))
             (t/is (not= (get-in @store (get-shape-path :constraints-h)) "fail"))
 
@@ -124,7 +126,7 @@
             (t/is (= (get-in @store (get-shape-path :constraints-h)) :right)))
 
           (t/testing " - constraintsVertical"
-            (set! (.-constraintsVertical shape) "fail")
+            (t/is (thrown? js/Error (set! (.-constraintsVertical shape) "fail")))
             (t/is (not= (.-constraintsVertical shape) "fail"))
             (t/is (not= (get-in @store (get-shape-path :constraints-v)) "fail"))
 
@@ -175,7 +177,7 @@
             (t/is (= (.-blendMode shape) "multiply"))
             (t/is (= (get-in @store (get-shape-path :blend-mode)) :multiply))
 
-            (set! (.-blendMode shape) "fail")
+            (t/is (thrown? js/Error (set! (.-blendMode shape) "fail")))
             (t/is (= (.-blendMode shape) "multiply"))
             (t/is (= (get-in @store (get-shape-path :blend-mode)) :multiply)))
 
@@ -194,7 +196,7 @@
                                                                     :color {:color "#fabada" :opacity 1}
                                                                     :hidden false}]))))
             (let [shadow #js {:style "fail"}]
-              (set! (.-shadows shape) #js [shadow])
+              (t/is (thrown? js/Error (set! (.-shadows shape) #js [shadow])))
               (t/is (= (-> (. shape -shadows) (aget 0) (aget "style")) "drop-shadow"))))
 
           (t/testing " - blur"
@@ -211,7 +213,7 @@
             (t/is (= (-> (. shape -exports) (aget 0) (aget "suffix")) "test"))
             (t/is (= (get-in @store (get-shape-path :exports)) [{:type :pdf :scale 2 :suffix "test" :skip-children false}]))
 
-            (set! (.-exports shape) #js [#js {:type 10 :scale 2 :suffix "test"}])
+            (t/is (thrown? js/Error (set! (.-exports shape) #js [#js {:type 10 :scale 2 :suffix "test"}])))
             (t/is (= (get-in @store (get-shape-path :exports)) [{:type :pdf :scale 2 :suffix "test" :skip-children false}])))
 
           (t/testing " - flipX"
@@ -234,7 +236,7 @@
             (t/is (= (get-in @store (get-shape-path :rotation)) 0)))
 
           (t/testing " - fills"
-            (set! (.-fills shape) #js [#js {:fillColor 100}])
+            (t/is (thrown? js/Error (set! (.-fills shape) #js [#js {:fillColor 100}])))
             (t/is (= (get-in @store (get-shape-path :fills)) [{:fill-color "#B1B2B5" :fill-opacity 1}]))
             (t/is (= (-> (. shape -fills) (aget 0) (aget "fillColor")) "#B1B2B5"))
 
diff --git a/frontend/test/frontend_tests/plugins/page_test.cljs b/frontend/test/frontend_tests/plugins/page_test.cljs
index bcc59c4ce8..d29149e846 100644
--- a/frontend/test/frontend_tests/plugins/page_test.cljs
+++ b/frontend/test/frontend_tests/plugins/page_test.cljs
@@ -32,6 +32,7 @@
         store   (ths/setup-store file)
         _       (set! st/state store)
         _       (set! st/stream (ptk/input-stream store))
+        _       (ptk/emit! store #(assoc-in % [:plugins :flags "00000000-0000-0000-0000-000000000000" :throw-validation-errors] true))
         context (api/create-context "00000000-0000-0000-0000-000000000000")]
     {:file file :store store :context context}))
 
@@ -89,9 +90,11 @@
         ^js page2   (aget pages 1)]
     (t/is (instance? js/Promise (.openPage context page2 true)))))
 
-(t/deftest test-open-page-invalid-arg-returns-nil
+(t/deftest test-open-page-invalid-arg-throws
+  ;; With throwValidationErrors enabled an invalid argument surfaces as an
+  ;; exception instead of being silently logged.
   (let [^js context (:context (setup))]
-    (t/is (nil? (.openPage context "not-a-page")))))
+    (t/is (thrown? js/Error (.openPage context "not-a-page")))))
 
 (t/deftest test-open-page-resolves-when-page-changes
   (t/async done
diff --git a/plugins/apps/poc-state-plugin/src/app/app.component.ts b/plugins/apps/poc-state-plugin/src/app/app.component.ts
index 0eae67b448..7a293a1210 100644
--- a/plugins/apps/poc-state-plugin/src/app/app.component.ts
+++ b/plugins/apps/poc-state-plugin/src/app/app.component.ts
@@ -45,6 +45,13 @@ import type { Shape } from '@penpot/plugin-types';
         <button type="button" data-appearance="secondary" (click)="resizeH()">
           Resize H
         </button>
+        <button
+          type="button"
+          data-appearance="secondary"
+          (click)="throwValidation()"
+        >
+          Throw validation error
+        </button>
         <button
           type="button"
           data-appearance="secondary"
@@ -304,6 +311,10 @@ export class AppComponent {
     this.#sendMessage({ content: 'resize-h', data: { id } });
   }
 
+  throwValidation() {
+    this.#sendMessage({ content: 'throw-validation' });
+  }
+
   loremIpsum() {
     this.#sendMessage({ content: 'lorem-ipsum' });
   }
diff --git a/plugins/apps/poc-state-plugin/src/plugin.ts b/plugins/apps/poc-state-plugin/src/plugin.ts
index 901e320f71..9b5d9f0095 100644
--- a/plugins/apps/poc-state-plugin/src/plugin.ts
+++ b/plugins/apps/poc-state-plugin/src/plugin.ts
@@ -24,6 +24,8 @@ penpot.ui.onMessage<{ content: string; data: unknown }>(async (message) => {
     resizeW(message.data as { id: string });
   } else if (message.content === 'resize-h') {
     resizeH(message.data as { id: string });
+  } else if (message.content === 'throw-validation') {
+    throwValidation();
   } else if (message.content === 'lorem-ipsum') {
     loremIpsum();
   } else if (message.content === 'add-icon') {
@@ -203,6 +205,29 @@ function resizeH(data: { id: string }) {
   }
 }
 
+function throwValidation() {
+  const rect = penpot.createRectangle();
+  const center = penpot.viewport.center;
+  rect.x = center.x;
+  rect.y = center.y;
+
+  // `x` expects a number. Assigning an invalid value triggers a validation
+  // error so the v1 vs v2 manifest behavior can be compared:
+  //  - v1 manifest: the error is only logged to the console and the value is
+  //    left untouched (no exception, the try block completes).
+  //  - v2 manifest: `penpot.flags.throwValidationErrors` defaults to true, so
+  //    the assignment throws synchronously and the catch block runs.
+  try {
+    (rect as unknown as { x: unknown }).x = 'not-a-number';
+    console.log(
+      '[validation] No exception thrown — v1 / log-only behavior. rect.x =',
+      rect.x,
+    );
+  } catch (err) {
+    console.error('[validation] Exception thrown — v2 / strict behavior:', err);
+  }
+}
+
 function loremIpsum() {
   const selection = penpot.selection;
 
diff --git a/plugins/libs/plugin-types/index.d.ts b/plugins/libs/plugin-types/index.d.ts
index e83fffe473..3e253043ee 100644
--- a/plugins/libs/plugin-types/index.d.ts
+++ b/plugins/libs/plugin-types/index.d.ts
@@ -1749,7 +1749,8 @@ export interface Flags {
   /**
    * If `true` the validation errors will throw an exception instead of displaying an
    * error in the debugger console.
-   * Defaults to false
+   * Defaults to `true` for plugins whose manifest declares `"version": 2` (or higher)
+   * and to `false` for v1 plugins (or manifests that omit the version field).
    */
   throwValidationErrors: boolean;
 }