diff --git a/tests/e2e/fake_gitea.py b/tests/e2e/fake_gitea.py
index 1efd791..9b6e5f6 100644
--- a/tests/e2e/fake_gitea.py
+++ b/tests/e2e/fake_gitea.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import json
 from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+from threading import Event
 from urllib.parse import parse_qs, urlsplit
 
 
@@ -51,6 +52,7 @@ class FakeGiteaServer(ThreadingHTTPServer):
         super().__init__(address, FakeGiteaHandler)
         self.created_issues: list[dict] = []
         self.issue_creation_enabled = False
+        self.issue_creation_ready = Event()
         self.assigned_issue_numbers = [issue["number"] for issue in AVAILABLE_ISSUES]
         self.comments: list[tuple[int, str]] = []
         self.requests: list[tuple[str, str]] = []
@@ -147,6 +149,8 @@ class FakeGiteaHandler(BaseHTTPRequestHandler):
         if path != "/api/v1/repos/acme/mobile/issues":
             self._json(404, {"message": "not found"})
             return
+        if not self.server.issue_creation_enabled:
+            self.server.issue_creation_ready.wait(timeout=45)
         if not self.server.issue_creation_enabled:
             self._json(503, {"message": "release journey is still offline"})
             return
diff --git a/tests/e2e/test_mobile_offline_issue_release.py b/tests/e2e/test_mobile_offline_issue_release.py
index 2ad2bbd..5c18145 100644
--- a/tests/e2e/test_mobile_offline_issue_release.py
+++ b/tests/e2e/test_mobile_offline_issue_release.py
@@ -232,6 +232,10 @@ def test_release_artifact_files_one_mobile_issue_exactly_once_after_offline_relo
             page.locator("#create-issue-repository").select_option("acme/mobile")
             expect(page.locator("#submit-new-issue")).to_be_enabled()
 
+            # Page offline emulation can leave service-worker requests connected.
+            # Abort the mutation at the browser boundary too, matching a real
+            # transport outage without poisoning server-side idempotency state.
+            context.route("**/api/v1/repos/acme/mobile/issues", lambda route: route.abort())
             context.set_offline(True)
             page.locator("#submit-new-issue").click()
             expect(page.locator("#issue-filing-review")).to_be_visible()
@@ -267,6 +271,8 @@ def test_release_artifact_files_one_mobile_issue_exactly_once_after_offline_relo
             browser_errors.clear()  # Chromium reports expected network errors while the context is offline.
             failed_responses.clear()
             fake.issue_creation_enabled = True
+            fake.issue_creation_ready.set()
+            context.unroute("**/api/v1/repos/acme/mobile/issues")
             context.set_offline(False)
             page.evaluate("window.dispatchEvent(new Event('online'))")
             # Containerized Actions runners can take longer than a local browser to wake the
@@ -275,12 +281,15 @@ def test_release_artifact_files_one_mobile_issue_exactly_once_after_offline_relo
                 if fake.created_issues:
                     break
                 page.wait_for_timeout(250)
+            local_debug = page.evaluate("localStorage.getItem('stackchain.issue-outbox.v1')")
+            durable_debug = indexed_issue_records(page)
             assert fake.created_issues == [
                 {"title": TITLE, "body": BODY, "assignee": "timmy"}
             ], (
                 f"url={page.url} ready={page.evaluate('document.readyState')} "
                 f"status={page.locator('#my-work-action-status').inner_text()!r} "
                 f"errors={browser_errors[-5:]!r} responses={failed_responses[-10:]!r} "
+                f"local={local_debug!r} durable={durable_debug!r} "
                 f"requests={fake.requests[-20:]!r}"
             )
             # Deferred workspace startup can report its already-issued offline request
@@ -310,6 +319,7 @@ def test_release_artifact_files_one_mobile_issue_exactly_once_after_offline_relo
             assert page.evaluate("document.documentElement.scrollWidth <= window.innerWidth")
             browser.close()
     finally:
+        fake.issue_creation_ready.set()
         fake.shutdown()
         fake.server_close()
         fake_thread.join(timeout=5)