diff --git a/src/scripting_api/event.js b/src/scripting_api/event.js
index c3f73b263..2df21a923 100644
--- a/src/scripting_api/event.js
+++ b/src/scripting_api/event.js
@@ -81,6 +81,15 @@ class EventDispatcher {
   }
 
   dispatch(baseEvent) {
+    if (
+      typeof PDFJSDev !== "undefined" &&
+      PDFJSDev.test("TESTING") &&
+      baseEvent.name === "sandboxtripbegin"
+    ) {
+      this._externalCall("send", [{ command: "sandboxTripEnd" }]);
+      return;
+    }
+
     const id = baseEvent.id;
     if (!(id in this._objects)) {
       let event;
@@ -233,7 +242,7 @@ class EventDispatcher {
     // Run format actions if any for all the fields.
     const event = (globalThis.event = new Event({}));
     for (const source of Object.values(this._objects)) {
-      event.value = source.obj.value;
+      event.value = source.obj._getValue();
       this.runActions(source, source, event, "Format");
     }
   }
@@ -245,8 +254,7 @@ class EventDispatcher {
 
       this.runCalculate(source, event);
 
-      const savedValue = source.obj._getValue();
-      event.value = source.obj.value;
+      const savedValue = (event.value = source.obj._getValue());
       let formattedValue = null;
 
       if (this.runActions(source, source, event, "Format")) {
diff --git a/test/integration/scripting_spec.mjs b/test/integration/scripting_spec.mjs
index 5f29be1ef..aef75c74e 100644
--- a/test/integration/scripting_spec.mjs
+++ b/test/integration/scripting_spec.mjs
@@ -27,6 +27,7 @@ import {
   loadAndWait,
   scrollIntoView,
   waitForEntryInStorage,
+  waitForSandboxTrip,
   waitForTimeout,
 } from "./test_utils.mjs";
 
@@ -2367,4 +2368,41 @@ describe("Interaction", () => {
       );
     });
   });
+
+  describe("Textfield with a zip code starting with 0", () => {
+    let pages;
+    let otherPages;
+
+    beforeAll(async () => {
+      otherPages = await Promise.all(
+        global.integrationSessions.map(async session =>
+          session.browser.newPage()
+        )
+      );
+      pages = await loadAndWait("bug1889122.pdf", getSelector("24R"));
+    });
+
+    afterAll(async () => {
+      await closePages(pages);
+      await Promise.all(otherPages.map(page => page.close()));
+    });
+
+    it("must check the zip code is correctly formatted", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page], i) => {
+          await page.waitForFunction(
+            "window.PDFViewerApplication.scriptingReady === true"
+          );
+
+          await page.click(getSelector("24R"));
+          await page.type(getSelector("24R"), "01234", { delay: 10 });
+          await page.keyboard.press("Tab");
+          await waitForSandboxTrip(page);
+
+          const text = await page.$eval(getSelector("24R"), el => el.value);
+          expect(text).withContext(`In ${browserName}`).toEqual("01234");
+        })
+      );
+    });
+  });
 });
diff --git a/test/integration/test_utils.mjs b/test/integration/test_utils.mjs
index 34718bb42..cf1f48fdc 100644
--- a/test/integration/test_utils.mjs
+++ b/test/integration/test_utils.mjs
@@ -85,6 +85,16 @@ function closePages(pages) {
   );
 }
 
+async function waitForSandboxTrip(page) {
+  const handle = await page.evaluateHandle(() => [
+    new Promise(resolve => {
+      window.addEventListener("sandboxtripend", resolve, { once: true });
+      window.PDFViewerApplication.pdfScriptingManager.sandboxTrip();
+    }),
+  ]);
+  await awaitPromise(handle);
+}
+
 function waitForTimeout(milliseconds) {
   /**
    * Wait for the given number of milliseconds.
@@ -583,6 +593,7 @@ export {
   waitForAnnotationEditorLayer,
   waitForEntryInStorage,
   waitForEvent,
+  waitForSandboxTrip,
   waitForSelectedEditor,
   waitForSerialized,
   waitForStorageEntries,
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index b4de951e1..d8515d1c7 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -640,3 +640,4 @@
 !issue17808.pdf
 !issue17871_bottom_right.pdf
 !issue17871_top_right.pdf
+!bug1889122.pdf
diff --git a/test/pdfs/bug1889122.pdf b/test/pdfs/bug1889122.pdf
new file mode 100644
index 000000000..18a5dbb9c
Binary files /dev/null and b/test/pdfs/bug1889122.pdf differ
diff --git a/web/pdf_scripting_manager.js b/web/pdf_scripting_manager.js
index f0c8ce91e..3dfb7c130 100644
--- a/web/pdf_scripting_manager.js
+++ b/web/pdf_scripting_manager.js
@@ -58,6 +58,19 @@ class PDFScriptingManager {
     this.#eventBus = eventBus;
     this.#externalServices = externalServices;
     this.#docProperties = docProperties;
+
+    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING")) {
+      Object.defineProperty(this, "sandboxTrip", {
+        value: () =>
+          setTimeout(
+            () =>
+              this.#scripting?.dispatchEventInSandbox({
+                name: "sandboxtripbegin",
+              }),
+            0
+          ),
+      });
+    }
   }
 
   setViewer(pdfViewer) {
@@ -258,6 +271,17 @@ class PDFScriptingManager {
 
     const { id, siblings, command, value } = detail;
     if (!id) {
+      if (
+        typeof PDFJSDev !== "undefined" &&
+        PDFJSDev.test("TESTING") &&
+        command === "sandboxTripEnd"
+      ) {
+        window.setTimeout(() => {
+          window.dispatchEvent(new CustomEvent("sandboxtripend"));
+        }, 0);
+        return;
+      }
+
       switch (command) {
         case "clear":
           console.clear();