@@ -145,11 +145,11 @@ export function withEventReplay(): Provider[] {
 
 appsWithEventReplay.add(appRef);
 
+const appId = injector.get(APP_ID);
 appRef.onDestroy(() => {
 appsWithEventReplay.delete(appRef);
 // Ensure that we're always safe calling this in the browser.
 if (typeof ngServerMode !== 'undefined' && !ngServerMode) {
-const appId = injector.get(APP_ID);
 // `_ejsa` should be deleted when the app is destroyed, ensuring that
 // no elements are still captured in the global list and are not prevented
 // from being garbage collected.

@@ -207,7 +207,16 @@ describe('event replay', () => {
 appRef.tick();
 const appId = appRef.injector.get(APP_ID);
 
+// Important: This is done intentionally because `ApplicationRef` registers
+// `onDestroy` callbacks, and we want to ensure that they execute successfully
+// without resulting in any errors. This is necessary because the bodies of
+// these `onDestroy` callbacks use the `ngServerMode` variable.
+// Prior to setting this flag, the unit test was throwing a "destroyed injector"
+// error — but we weren't capturing it because we hadn't explicitly set the flag to false.
+globalThis['ngServerMode'] = false;
 appRef.destroy();
+globalThis['ngServerMode'] = undefined;
+
 // This ensure that `_ejsas` for the current application is cleaned up
 // once the application is destroyed.
 expect(window._ejsas![appId]).toBeUndefined();