diff --git a/test-issue-180-packets-url-modal-e2e.js b/test-issue-180-packets-url-modal-e2e.js
index 5dadbec3f..efecc461a 100644
--- a/test-issue-180-packets-url-modal-e2e.js
+++ b/test-issue-180-packets-url-modal-e2e.js
@@ -49,11 +49,6 @@ async function fresh(page, url) {
   await page.reload({ waitUntil: 'load' });
 }
 
-// The "Latest Packets (N)" count, once the list has rendered.
-async function listCount(page) {
-  await page.waitForSelector('#pktLeft .count', { timeout: 15000 });
-  return page.evaluate(() => Number((document.querySelector('#pktLeft .count').textContent.match(/\d+/) || [])[0]));
-}
 function clearShown(page) {
   return page.evaluate(() => {
     const b = document.getElementById('clearFiltersBtn');
@@ -102,27 +97,78 @@ function detailPaneOpen(page) {
       await waitFor(page, () => /\(1\)/.test(document.querySelector('#pktLeft .count').textContent), 'detail URL did not filter the list to 1 packet');
       assert(await clearShown(page), 'Clear button hidden on the filtered detail URL');
 
-      // The fixture's packets may have aged out of the default 15 min window
-      // that Clear restores, so compare what Clear showed with what the
-      // reload shows rather than expecting a number of rows.
       const listLoaded = () => page.waitForResponse((r) => /\/api\/packets\?/.test(r.url()), { timeout: 15000 });
       await Promise.all([listLoaded(), page.click('#clearFiltersBtn')]);
       await page.waitForTimeout(500);
       let h = await page.evaluate(() => location.hash);
+      // What Clear itself must do, asserted right after the click: the bare
+      // list URL, the Clear button gone and the detail pane closed. These are
+      // what a "Clear keeps ?timeWindow=" or "Clear keeps the detail" mutant
+      // breaks. (The window reset to the default is not visible here beyond
+      // Clear being hidden; it is asserted across the reload below.)
       assert(h === '#/packets', 'URL after Clear: ' + h);
-      const shown = await listCount(page);
       assert(!(await clearShown(page)), 'Clear button still visible after Clear');
       assert(!(await detailPaneOpen(page)), 'detail pane still open after Clear');
 
+      // Reloading the URL Clear wrote must give Clear's own state back —
+      // that is the "a reload shows the same list" half of this step, and the
+      // one a mutant where Clear's default no longer matches the default a
+      // cold load restores breaks. Compare STATE (URL, Clear button, the
+      // saved window, the detail pane, the hash input), all of which are
+      // clock-independent; the list contents are compared separately below at
+      // a pinned window, because row counts at the default window are not
+      // (#271).
+      const windowValue = () => page.evaluate(() => document.getElementById('fTimeWindow').value);
+      const twAfterClear = await windowValue();
       await Promise.all([listLoaded(), page.reload({ waitUntil: 'load' })]);
       await page.waitForTimeout(500);
       h = await page.evaluate(() => location.hash);
-      assert(h === '#/packets', 'URL after reload: ' + h);
-      const reloaded = await listCount(page);
-      assert(reloaded === shown, 'reload shows ' + reloaded + ' packets, Clear showed ' + shown);
+      assert(h === '#/packets', 'URL after reloading the Clear state: ' + h);
       assert(!(await clearShown(page)), 'Clear button back after reload');
-      assert(!(await detailPaneOpen(page)), 'detail pane open after reload');
+      const twAfterReload = await windowValue();
+      assert(twAfterReload === twAfterClear, 'time window after reload ' + twAfterReload + ', after Clear ' + twAfterClear);
+      assert(!(await detailPaneOpen(page)), 'detail pane open after reloading the Clear state');
       assert(await page.evaluate(() => document.getElementById('fHash').value === ''), 'hash filter input filled after reload');
+
+      // #271: the list-contents half of this step used to compare row COUNTS
+      // at the default 15-min window across two renders (Clear's in-SPA list,
+      // then a full reload). Both compute `since = now - 15min` from the
+      // browser's live clock, so a fixture packet can cross that boundary in
+      // the real-time gap between the two fetches, and the CI fixture ages
+      // while the job runs (same class of problem #252 fixed for the Details
+      // test). Pin a wide window (24h; the widest option, same as #252) and
+      // compare the "Latest Packets (N)" total — the whole filtered set —
+      // plus the hashes of the rows actually rendered, so the comparison
+      // cannot depend on how old the fixture is.
+      await Promise.all([listLoaded(), page.evaluate(() => {
+        const sel = document.getElementById('fTimeWindow');
+        sel.value = '1440';
+        sel.dispatchEvent(new Event('change', { bubbles: true }));
+      })]);
+      await page.waitForTimeout(500);
+      // The table is virtualised, so only a window of rows is in the DOM at
+      // any time: `total` is the full filtered count, `hashes` is what is
+      // rendered. The two #vscroll-* spacer rows carry no data-hash and are
+      // dropped, so an empty table cannot pass as "a set of hashes".
+      const listState = async () => {
+        await page.waitForSelector('#pktLeft .count', { timeout: 15000 });
+        return page.evaluate(() => ({
+          total: Number((document.querySelector('#pktLeft .count').textContent.match(/\d+/) || [])[0]),
+          hashes: Array.from(document.querySelectorAll('#pktBody > tr:not(.group-child)')).map((tr) => tr.dataset.hash).filter(Boolean).sort(),
+        }));
+      };
+      const shown = await listState();
+      assert(shown.total > 0, 'no packets in the pinned 24h window');
+      assert(shown.hashes.length > 0, 'no rendered rows with a hash to compare at the pinned 24h window');
+
+      await Promise.all([listLoaded(), page.reload({ waitUntil: 'load' })]);
+      await page.waitForTimeout(500);
+      h = await page.evaluate(() => location.hash);
+      assert(h === '#/packets?timeWindow=1440', 'URL after reloading the pinned window: ' + h);
+      const reloaded = await listState();
+      assert(reloaded.total === shown.total, 'reload shows ' + reloaded.total + ' packets at the pinned window, before the reload it showed ' + shown.total);
+      assert(JSON.stringify(reloaded.hashes) === JSON.stringify(shown.hashes), 'reload renders ' + JSON.stringify(reloaded.hashes) + ' at the pinned window, before the reload it rendered ' + JSON.stringify(shown.hashes));
+      assert(!(await detailPaneOpen(page)), 'detail pane open after reloading the pinned window');
     });
     await context.close();
   }