diff --git a/src/display/api.js b/src/display/api.js
index 1a291ae8e..055a9e985 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -1140,12 +1140,9 @@ class PDFPageProxy {
    *   {Object} with JS actions.
    */
   getJSActions() {
-    if (!this._jsActionsPromise) {
-      this._jsActionsPromise = this._transport.getPageJSActions(
-        this._pageIndex
-      );
-    }
-    return this._jsActionsPromise;
+    return (this._jsActionsPromise ||= this._transport.getPageJSActions(
+      this._pageIndex
+    ));
   }
 
   /**
diff --git a/web/app.js b/web/app.js
index e36e5f1a8..45e156734 100644
--- a/web/app.js
+++ b/web/app.js
@@ -1564,24 +1564,15 @@ const PDFViewerApplication = {
     internalEvents.set("updatefromsandbox", updateFromSandbox);
 
     const visitedPages = new Map();
-    const pageOpen = ({ pageNumber }) => {
+    const pageOpen = ({ pageNumber, actionsPromise }) => {
       visitedPages.set(
         pageNumber,
         (async () => {
           // Avoid sending, and thus serializing, the `actions` data
-          // when the same page is open several times.
+          // when the same page is opened several times.
           let actions = null;
           if (!visitedPages.has(pageNumber)) {
-            // visitedPages doesn't contain pageNumber: first visit.
-
-            const pageView = this.pdfViewer.getPageView(
-              /* index = */ pageNumber - 1
-            );
-            if (pageView?.pdfPage) {
-              actions = await pageView.pdfPage.getJSActions();
-            } else {
-              actions = await pdfDocument.getPage(pageNumber).getJSActions();
-            }
+            actions = await actionsPromise;
 
             if (pdfDocument !== this.pdfDocument) {
               return; // The document was closed while the actions resolved.
@@ -1599,14 +1590,15 @@ const PDFViewerApplication = {
     };
 
     const pageClose = async ({ pageNumber }) => {
-      const promise = visitedPages.get(pageNumber);
-      if (!promise) {
+      const actionsPromise = visitedPages.get(pageNumber);
+      if (!actionsPromise) {
+        // Ensure that the "pageclose" event was preceded by a "pageopen" event.
         return;
       }
       visitedPages.set(pageNumber, null);
 
-      // Wait for PageOpen has been sent.
-      await promise;
+      // Ensure that the "pageopen" event is handled first.
+      await actionsPromise;
 
       if (pdfDocument !== this.pdfDocument) {
         return; // The document was closed while the actions resolved.
diff --git a/web/base_viewer.js b/web/base_viewer.js
index c9935ec1b..4060145c9 100644
--- a/web/base_viewer.js
+++ b/web/base_viewer.js
@@ -1526,7 +1526,11 @@ class BaseViewer {
       if (pageView?.renderingState === RenderingStates.FINISHED) {
         pageOpenPendingSet.delete(pageNumber);
 
-        eventBus.dispatch("pageopen", { source: this, pageNumber });
+        eventBus.dispatch("pageopen", {
+          source: this,
+          pageNumber,
+          actionsPromise: pageView.pdfPage?.getJSActions(),
+        });
       } else {
         pageOpenPendingSet.add(pageNumber);
       }