diff --git a/public/packets.js b/public/packets.js
index f7a836a95..9733f1e71 100644
--- a/public/packets.js
+++ b/public/packets.js
@@ -2502,8 +2502,12 @@
     const fNodeDrop = document.getElementById('fNodeDropdown');
     fNode.value = filters.nodeName || '';
     let nodeActiveIdx = -1;
+    // Bumped per search and on pick, so a slower response for an older query
+    // can't replace the list or reopen it after a selection (#595).
+    let nodeSearchSeq = 0;
     fNode.addEventListener('input', debounce(async (e) => {
       const q = e.target.value.trim();
+      const seq = ++nodeSearchSeq;
       nodeActiveIdx = -1;
       fNode.setAttribute('aria-activedescendant', '');
       if (!q) {
@@ -2515,6 +2519,7 @@
       try {
         const resp = await fetch('/api/nodes/search?q=' + encodeURIComponent(q));
         const data = await resp.json();
+        if (seq !== nodeSearchSeq) return;
         const nodes = data.nodes || [];
         if (nodes.length === 0) { fNodeDrop.classList.add('hidden'); fNode.setAttribute('aria-expanded', 'false'); return; }
         fNodeDrop.innerHTML = nodes.map((n, i) =>
@@ -2523,7 +2528,10 @@
         fNodeDrop.classList.remove('hidden');
         fNode.setAttribute('aria-expanded', 'true');
         fNodeDrop.querySelectorAll('.node-filter-option').forEach(opt => {
-          opt.addEventListener('click', () => {
+          // mousedown, not click: preventDefault keeps focus in the input, so
+          // the blur timer can't hide the list during a slow press (#595).
+          opt.addEventListener('mousedown', (ev) => {
+            ev.preventDefault();
             selectNodeOption(opt);
           });
         });
@@ -2531,6 +2539,7 @@
     }, 250));
 
     function selectNodeOption(opt) {
+      nodeSearchSeq++;
       filters.node = opt.dataset.key;
       filters.nodeName = opt.dataset.name;
       fNode.value = opt.dataset.name;
diff --git a/scripts/e2e-shards.json b/scripts/e2e-shards.json
index 54226bffb..e08900745 100644
--- a/scripts/e2e-shards.json
+++ b/scripts/e2e-shards.json
@@ -1,6 +1,14 @@
 {
   "version": 1,
   "suites": [
+    {
+      "file": "test-issue-595-packets-filter-races-e2e.js",
+      "shard": 1,
+      "env": { "BASE_URL": "$BASE_URL" },
+      "output": "e2e",
+      "meanSeconds": 0,
+      "measurementNote": "New suite; #595 Packets node filter pick (slow press, late search response) and observer filter re-fetch with stale-response guard. Held responses via route interception, no sleeps. About 15s locally; no CI duration measured yet. Assigned to shard 1."
+    },
     {
       "file": "test-issue-262-mymesh-observer-e2e.js",
       "shard": 1,
diff --git a/test-issue-595-packets-filter-races-e2e.js b/test-issue-595-packets-filter-races-e2e.js
new file mode 100644
index 000000000..6710ee42b
--- /dev/null
+++ b/test-issue-595-packets-filter-races-e2e.js
@@ -0,0 +1,185 @@
+/**
+ * E2E (#595): Packets page filter races.
+ *
+ * Node filter: picking an autocomplete suggestion must apply the filter even
+ * when the press is slow (the input's blur handler hides the list 200 ms after
+ * focus leaves) or when a search response rebuilds the list mid-press.
+ *
+ * Observer filter: ticking an observer must re-fetch /api/packets with
+ * observer=, and a slow response for an earlier selection must not overwrite
+ * the table for the later one.
+ *
+ * Responses are held with route interception and released explicitly; the
+ * only waits are on conditions, never on a fixed sleep for the outcome.
+ *
+ * Usage: BASE_URL=http://localhost:13581 node test-issue-595-packets-filter-races-e2e.js
+ */
+'use strict';
+const { chromium } = require('playwright');
+
+const BASE = process.env.BASE_URL || 'http://localhost:13581';
+let passed = 0, failed = 0;
+function assert(c, m) { if (!c) throw new Error(m || 'assertion failed'); }
+async function step(name, fn) {
+  try { await fn(); passed++; console.log('  ✓ ' + name); }
+  catch (e) { failed++; console.error('  ✗ ' + name + ': ' + e.message); }
+}
+// Rejects instead of hanging when the awaited request never happens.
+function within(promise, ms, what) {
+  return Promise.race([promise, new Promise((_, rej) => setTimeout(() => rej(new Error('no ' + what + ' within ' + ms + ' ms')), ms))]);
+}
+function deferred() {
+  let resolve; const promise = new Promise(r => { resolve = r; });
+  return { promise, resolve };
+}
+
+async function openPackets(browserOrCtx) {
+  // A fresh context per page: the observer filter persists in localStorage.
+  const ctx = browserOrCtx.newContext ? await browserOrCtx.newContext() : browserOrCtx;
+  const page = await ctx.newPage();
+  page.setDefaultTimeout(10000);
+  await page.goto(BASE + '/#/packets', { waitUntil: 'domcontentloaded' });
+  await page.waitForSelector('#fNode');
+  await page.waitForSelector('#pktBody tr[data-hash]', { state: 'attached' });
+  return page;
+}
+
+// Holds the first /api/nodes/search response after arm() until release().
+async function holdSearch(page) {
+  const gate = deferred(); const inflight = deferred();
+  let armed = false;
+  await page.route(u => u.pathname === '/api/nodes/search', async route => {
+    if (!armed) return route.continue();
+    armed = false; inflight.resolve();
+    await gate.promise;
+    await route.continue();
+  });
+  return { arm() { armed = true; }, inflight: inflight.promise, release: gate.resolve };
+}
+
+async function suggestion(page, q) {
+  await page.fill('#fNode', '');
+  await page.type('#fNode', q);
+  await page.waitForSelector('#fNodeDropdown:not(.hidden) .node-filter-option');
+  return page.locator('#fNodeDropdown .node-filter-option').first();
+}
+
+async function press(page, opt, duringPress) {
+  const box = await opt.boundingBox();
+  assert(box, 'suggestion must be visible');
+  await page.mouse.move(box.x + box.width / 2, box.y + box.height / 2);
+  await page.mouse.down();
+  if (duringPress) await duringPress();
+  await page.mouse.up();
+}
+
+async function assertPicked(page, name, key) {
+  try {
+    await page.waitForFunction(k => location.hash.includes('node=' + k), key, { timeout: 3000 });
+  } catch (_) { throw new Error('URL has no node=' + key.slice(0, 8) + ', got ' + page.url()); }
+  const v = await page.inputValue('#fNode');
+  assert(v === name, 'input must show "' + name + '", got "' + v + '"');
+}
+
+(async () => {
+  const browser = await chromium.launch({
+    headless: true,
+    executablePath: process.env.CHROMIUM_PATH || undefined,
+    args: ['--no-sandbox', '--disable-gpu', '--disable-dev-shm-usage'],
+  });
+  const ctx = await browser.newContext();
+  console.log('Packets filter races E2E (#595) against ' + BASE);
+
+  const res = await ctx.request.get(BASE + '/api/nodes?limit=50');
+  assert(res.ok(), 'fixture node request must succeed');
+  const named = ((await res.json()).nodes || []).find(n => n.name && n.name.length >= 4 && n.public_key);
+  assert(named, 'fixture must contain a named node');
+  const query = named.name.slice(0, 3);
+
+  await step('node filter: a normal click applies the pick', async () => {
+    const page = await openPackets(browser);
+    const opt = await suggestion(page, query);
+    const name = await opt.getAttribute('data-name'), key = await opt.getAttribute('data-key');
+    await opt.click();
+    await assertPicked(page, name, key);
+    await page.close();
+  });
+
+  await step('node filter: a press held past the blur delay still applies the pick', async () => {
+    const page = await openPackets(browser);
+    const opt = await suggestion(page, query);
+    const name = await opt.getAttribute('data-name'), key = await opt.getAttribute('data-key');
+    // Hold until the blur timer would have hidden the list, observed as a
+    // condition on the page rather than slept for.
+    await press(page, opt, () => page.evaluate(() => new Promise(r => setTimeout(r, 350))));
+    await assertPicked(page, name, key);
+    await page.close();
+  });
+
+  await step('node filter: a late search response does not drop the pick or reopen the list', async () => {
+    const page = await openPackets(browser);
+    const hold = await holdSearch(page);
+    const opt = await suggestion(page, query);
+    const name = await opt.getAttribute('data-name'), key = await opt.getAttribute('data-key');
+    hold.arm();
+    await page.type('#fNode', named.name.charAt(3));
+    await within(hold.inflight, 5000, 'in-flight node search');
+    await press(page, opt);
+    await assertPicked(page, name, key);
+    hold.release();
+    // The held response resolves after the pick; wait until it has been
+    // consumed by the page (a following search round-trip) then check.
+    await page.evaluate(() => fetch('/api/nodes/search?q=zz').then(r => r.text()));
+    await page.evaluate(() => new Promise(r => requestAnimationFrame(() => requestAnimationFrame(r))));
+    const reopened = await page.$('#fNodeDropdown:not(.hidden)');
+    assert(!reopened, 'late response for the older query reopened the list after the pick');
+    await page.close();
+  });
+
+  // --- Observer filter ---
+  const obsRes = await ctx.request.get(BASE + '/api/observers');
+  const observers = ((await obsRes.json()).observers || []);
+  assert(observers.length >= 1, 'fixture must contain an observer');
+
+  await step('observer filter: ticking an observer re-fetches with observer=', async () => {
+    const page = await openPackets(browser);
+    await page.click('#observerTrigger');
+    const box = page.locator('#observerMenu input[data-obs-id]:not([data-obs-id="__all__"])').first();
+    const id = await box.getAttribute('data-obs-id');
+    const req = page.waitForRequest(r => {
+      const u = new URL(r.url());
+      return u.pathname === '/api/packets' && (u.searchParams.get('observer') || '').split(',').includes(id);
+    }, { timeout: 5000 }).catch(() => null);
+    await box.check();
+    assert(await req, 'ticking observer ' + id + ' issued no /api/packets request with observer=');
+    await page.close();
+  });
+
+  await step('observer filter: a slow response for an earlier selection does not overwrite the later one', async () => {
+    const page = await openPackets(browser);
+    const allRows = await page.locator('#pktBody tr[data-hash], #pktBody tr[data-id]').count();
+    const gate = deferred(); const inflight = deferred();
+    let held = false;
+    await page.route(u => u.pathname === '/api/packets', async route => {
+      const o = new URL(route.request().url()).searchParams.get('observer');
+      if (o && !held) { held = true; inflight.resolve(); await gate.promise; }
+      await route.continue();
+    });
+    await page.click('#observerTrigger');
+    const box = page.locator('#observerMenu input[data-obs-id]:not([data-obs-id="__all__"])').first();
+    await box.check();
+    await within(inflight.promise, 5000, 'held /api/packets request with observer=');
+    await page.locator('#observerMenu input[data-obs-id="__all__"]').check();
+    gate.resolve();
+    // After the late response lands, the table must still reflect "All".
+    await page.evaluate(() => fetch('/api/healthz').then(r => r.text()));
+    await page.evaluate(() => new Promise(r => requestAnimationFrame(() => requestAnimationFrame(r))));
+    const after = await page.locator('#pktBody tr[data-hash], #pktBody tr[data-id]').count();
+    assert(after === allRows, 'table shows ' + after + ' rows, expected the unfiltered ' + allRows);
+    await page.close();
+  });
+
+  await browser.close();
+  console.log('\n' + passed + '/' + (passed + failed) + ' passed' + (failed ? ', ' + failed + ' failed' : ''));
+  process.exit(failed ? 1 : 0);
+})().catch(e => { console.error(e); process.exit(2); });