diff --git a/frontend/e2e/helpers/e2e-helpers.playwright.ts b/frontend/e2e/helpers/e2e-helpers.playwright.ts
index 543efe790b67..f93f07368f82 100644
--- a/frontend/e2e/helpers/e2e-helpers.playwright.ts
+++ b/frontend/e2e/helpers/e2e-helpers.playwright.ts
@@ -872,14 +872,38 @@ export class E2EHelpers {
     if (entityName) {
       await this.click(byId(`permissions-${entityName.toLowerCase()}`));
     }
+    // The toggle saves async via POST/PUT to .../user-permissions/. Await it
+    // before closing the modal — otherwise logout can abort the in-flight
+    // save and the grant never lands, so the next user can't see the entity.
+    const saved = this.page.waitForResponse(
+      (res) =>
+        res.url().includes('/user-permissions/') &&
+        res.request().method() !== 'GET',
+      { timeout: LONG_TIMEOUT },
+    );
     if (permission === 'ADMIN') {
       await this.click(byId(`admin-switch-${level}`));
     } else {
       await this.click(byId(`permission-switch-${permission}`));
     }
+    await saved;
     await this.closeModal();
   }
 
+  // Reload the page until a selector becomes visible. For state that is
+  // eventually consistent across a fresh navigation (e.g. a just-granted
+  // permission) — waiting on a single page load can't help, because the data
+  // was already fetched without it.
+  async reloadUntilVisible(selector: string, timeout: number = LONG_TIMEOUT) {
+    logUsingLastSection(`Reload until visible ${selector}`);
+    await expect(async () => {
+      await this.page.reload();
+      await expect(this.page.locator(selector).first()).toBeVisible({
+        timeout: 5000,
+      });
+    }).toPass({ timeout });
+  }
+
   // Create a tag
   async createTag(label: string, color: string = '#FF6B6B') {
     logUsingLastSection(`Creating tag: ${label}`);
diff --git a/frontend/e2e/tests/environment-permission-test.pw.ts b/frontend/e2e/tests/environment-permission-test.pw.ts
index 7bc3a5b56ee3..be725b0c512e 100644
--- a/frontend/e2e/tests/environment-permission-test.pw.ts
+++ b/frontend/e2e/tests/environment-permission-test.pw.ts
@@ -26,6 +26,7 @@ test.describe('Environment Permission Tests', () => {
       gotoTraits,
       login,
       logout,
+      reloadUntilVisible,
       setUserPermission,
       toggleFeature,
       waitForElementClickable,
@@ -87,7 +88,9 @@ test.describe('Environment Permission Tests', () => {
     log('User with permissions can see environment')
     await login(E2E_NON_ADMIN_USER_WITH_ENV_PERMISSIONS, PASSWORD)
     await gotoProject(PROJECT_NAME)
-    await waitForElementVisible(byId('switch-environment-production'))
+    // VIEW_ENVIRONMENT was just granted; the env list was fetched on
+    // navigation, so reload until it reflects the new permission.
+    await reloadUntilVisible(byId('switch-environment-production'))
     await logout()
 
     log('User with permissions can update feature state')