Fix

packages/embed/src/standalone/index.ts

@@ -229,7 +229,11 @@ const GitBook = (...args: StandaloneCalls) => {
                 }
             }
 
-            getIframe();
+            const { frame } = getIframe();
+            // Always propagate configuration updates, even when color-scheme doesn't change.
+            frame.configure({
+                ...frameConfiguration,
+            });
             pushColorSchemeToFrame();
             break;
         }

packages/gitbook/src/components/Embeddable/EmbeddableIframeAPI.tsx

@@ -108,7 +108,7 @@ export function EmbeddableIframeAPI(props: {
 
 /** Subscribe to embed configuration from the parent (Zustand). */
 export function useEmbeddableConfiguration<T>(
-    selector: (state: GitBookEmbeddableConfiguration) => T,
+    selector: (state: GitBookEmbeddableConfiguration) => T
 ): T {
     return useStore(embeddableConfiguration, selector);
 }