diff --git a/extension/entry-matrix.selftest.js b/extension/entry-matrix.selftest.js
index d2ea2a7..2002f6d 100644
--- a/extension/entry-matrix.selftest.js
+++ b/extension/entry-matrix.selftest.js
@@ -170,7 +170,8 @@ const ALLOW = [
   // 3c: the gone video's sentence; whether 重试 shows is remedies'.
   ["content.js", "MdgSites.isBiliVideoGone(state.readCode) ? MdgErrors.LABEL.videoGone", "说法：视频已失效"],
   ["sidepanel.js", "MdgSites.isBiliVideoGone(resp?.code) ? MdgErrors.LABEL.videoGone", "说法：视频已失效"],
-  ["sidepanel.js", "const gone = !ok && MdgSites.isBiliVideoGone(response?.code);", "说法：VIDEO_GONE（只能查看，不能继续提问）"],
+  ["sidepanel.js", "const gone = MdgSites.isBiliVideoGone(response?.code);", "说法：VIDEO_GONE（只能查看，不能继续提问）"],
+  ["sidepanel.js", "MdgSites.isBiliVideoGone(failed?.code) ? VIDEO_GONE", "说法：VIDEO_GONE（读取失败存在 view().failed，静默读取也只能查看）"],
   ["sidepanel.js", "MdgSites.isBiliVideoGone(response?.code) ? null : undefined", "已失效的视频补全标题时不再重查，不显示错误"]
 ];
 const used = ALLOW.map(() => 0);
diff --git a/extension/sidepanel-state.js b/extension/sidepanel-state.js
index 76b01ea..54f2eb7 100644
--- a/extension/sidepanel-state.js
+++ b/extension/sidepanel-state.js
@@ -181,7 +181,8 @@
 
   // live: the active tab (context is its payload, or the placeholder of a video followed from its URL alone).
   // conv: the shown conversation. pinned is its own context's description once it has one (saved, opened from a
-  // reference, or asked in); resolved is that context loaded; failed: loading it failed, so it is no longer pending.
+  // reference, or asked in); resolved is that context loaded; failed: loading it failed, so it is no longer pending:
+  // { code (the read's error code), text (said under it; "" when the load was silent) }.
   // fill: its AI 总结 prompt is still to fill. unanswered: the last question when its reply failed or stopped before a
   // word came, kept only to draw it again. convs (MdgCommon.latest): the shown conversation's run; showing another one
   // ends it, so a load or a drawing begun on the one before can tell.
@@ -192,7 +193,7 @@
   function create() {
     const s = {
       live: { tabUrl: "", context: null, key: "", error: "", lastVideoUrl: "" },
-      conv: { id: "", pinned: null, messages: [], resolved: null, failed: false, fill: false, unanswered: null, autoSend: null },
+      conv: { id: "", pinned: null, messages: [], resolved: null, failed: null, fill: false, unanswered: null, autoSend: null },
       convs: MdgCommon.latest(),
       turn: idleTurn(),
       detached: new Map(),
@@ -229,7 +230,7 @@
   function view(s) {
     const context = shown(s);
     const key = shownKey(s);
-    const { id, pinned, messages, resolved, unanswered } = s.conv;
+    const { id, pinned, messages, resolved, failed, unanswered } = s.conv;
     const target = shownPartUrl(s);
     return {
       context,
@@ -239,6 +240,7 @@
       pinned,
       messages,
       resolved,
+      failed,
       run: s.convs.current,
       unanswered,
       turn: s.turn.phase,
@@ -292,7 +294,7 @@
       effects.push({ type: "draft" });
     }
     s.convs.next();
-    s.conv = { id: "", pinned: null, messages: [], resolved: null, failed: false, fill: false, unanswered: null, autoSend: null };
+    s.conv = { id: "", pinned: null, messages: [], resolved: null, failed: null, fill: false, unanswered: null, autoSend: null };
     effects.push(...reattach(s, conversation));
     if (conversation) {
       s.conv.id = conversation.id;
@@ -604,15 +606,15 @@
       case "GRANT_DENIED":
         s.conv.autoSend = null;
         return [];
-      // A conversation's own context loaded (payload) or failed; a load started for an earlier conversation (its run
-      // ended) is ignored.
+      // A conversation's own context loaded (payload) or failed (code, text: conv.failed); a load started for an
+      // earlier conversation (its run ended) is ignored.
       case "CONTEXT_RESOLVED": {
         if (!event.run?.alive || !s.conv.pinned) {
           return [];
         }
         if (!event.payload) {
           const wasPending = Boolean(shown(s)?.pending);
-          s.conv.failed = true;
+          s.conv.failed = { code: event.code, text: event.text || "" };
           return [{ type: "resolveFailed", wasPending }];
         }
         const payload = event.payload;
@@ -625,6 +627,7 @@
           contextRef: buildConversationContextRef(payload)
         };
         s.conv.resolved = payload;
+        s.conv.failed = null;
         return [{ type: "resolved" }];
       }
       case "OPEN":
diff --git a/extension/sidepanel-state.selftest.js b/extension/sidepanel-state.selftest.js
index a052217..4ec6a76 100644
--- a/extension/sidepanel-state.selftest.js
+++ b/extension/sidepanel-state.selftest.js
@@ -252,6 +252,20 @@ function panel({ tab = video("BV1aa"), list = [] } = {}) {
   p.dispatch({ type: "OPEN", id: "h" });
   assert.deepStrictEqual(plain(p.dispatch({ type: "CONTEXT_RESOLVED", run: p.view().run, payload: null })), [{ type: "resolveFailed", wasPending: true }]);
   assert.strictEqual(p.view().context.pending, false);
+  // The failure is the conversation's: kept for redraws, a silent one without words (still gone); one for the
+  // conversation shown before is ignored, and showing another conversation or a load that works clears it.
+  assert.strictEqual(p.view().failed.text, "");
+  const hRun = p.view().run;
+  p.dispatch({ type: "CONTEXT_RESOLVED", run: hRun, payload: null, code: -404, text: "" });
+  assert.deepStrictEqual(plain(p.view().failed), { code: -404, text: "" });
+  p.dispatch({ type: "OPEN", id: "g" });
+  assert.strictEqual(p.view().failed, null);
+  p.dispatch({ type: "CONTEXT_RESOLVED", run: hRun, payload: null, code: -404, text: "gone" });
+  assert.strictEqual(p.view().failed, null, "stale");
+  p.dispatch({ type: "CONTEXT_RESOLVED", run: p.view().run, payload: null, code: "THROTTLED", text: "限流" });
+  assert.deepStrictEqual(plain(p.view().failed), { code: "THROTTLED", text: "限流" });
+  p.dispatch({ type: "CONTEXT_RESOLVED", run: p.view().run, payload: video("BV1gg") });
+  assert.strictEqual(p.view().failed, null);
   // The tab's own video: the live context, nothing to resolve.
   const q = panel({ list: [saved("a", video("BV1aa"))] });
   q.dispatch({ type: "NEW" });
diff --git a/extension/sidepanel.js b/extension/sidepanel.js
index ba03427..d2d11a0 100644
--- a/extension/sidepanel.js
+++ b/extension/sidepanel.js
@@ -324,9 +324,9 @@ const REPLY_RUNNING = "上一个回答还在生成，结束后才能继续问";
 // Why the shown conversation cannot be asked in now: a web page not read, a video that is gone, or its last reply
 // still running out of reach.
 function readOnlyReason() {
-  const { nonVideo, context, replyDetached } = state.view();
+  const { nonVideo, context, replyDetached, failed } = state.view();
   if (replyDetached) return REPLY_RUNNING;
-  return nonVideo ? pageReason(context) : contextFailure()?.gone ? VIDEO_GONE : "";
+  return nonVideo ? pageReason(context) : MdgSites.isBiliVideoGone(failed?.code) ? VIDEO_GONE : "";
 }
 
 // Why a web page cannot be asked about, by background.js readWebPage's pageAccess; "" once its main text is read. A page
@@ -1619,9 +1619,9 @@ function renderConversationMessages() {
     els.messages.appendChild(node);
     appendReplyEnd(node, { ...unanswered, raw: "", saved: false });
   }
-  const failed = nonVideo ? pageReason(state.view().context) : contextFailure()?.text;
+  const failed = nonVideo ? pageReason(state.view().context) : state.view().failed?.text;
   if (failed) {
-    showConversationContextError(failed, nonVideo ? null : contextFailure().remedy);
+    showConversationContextError(failed, nonVideo ? null : contextRemedy());
   }
   renderFollowups();
   drawnRun = run;
@@ -1685,11 +1685,6 @@ async function ensureCurrentContextForSend() {
   return true;
 }
 
-// The shown conversation's own video failed to load: { run (its conversation's), text (said under it, again at each
-// redraw; "" when the load was silent), gone (deleted or hidden on B站: the conversation is only read) }.
-let lastContextFailure = null;
-const contextFailure = () => (lastContextFailure?.run.alive ? lastContextFailure : null);
-
 // Loads the shown conversation's own context (state decides when: resolve effects). A load the conversation was
 // switched away from meanwhile does nothing. notice: the 正在加载… line it takes down when done.
 async function hydratePinnedConversationContext({ silent = false, notice = null } = {}) {
@@ -1716,16 +1711,15 @@ async function hydratePinnedConversationContext({ silent = false, notice = null
     error: error?.message || String(error || "")
   }));
   const ok = Boolean(response?.ok && response.payload);
-  const [result] = state.dispatch({ type: "CONTEXT_RESOLVED", run, payload: ok ? response.payload : null });
+  // Deleted or hidden on B站 (as the 分拣台 and 摘读记录 tell it): no retry will bring it back, and the conversation is
+  // only read. Else a send tries again.
+  const gone = MdgSites.isBiliVideoGone(response?.code);
+  const failure = ok ? {} : { code: response?.code, text: silent ? "" : gone ? VIDEO_GONE : `读取原${sourceKind()}失败：${MdgErrors.text(response)}` };
+  const [result] = state.dispatch({ type: "CONTEXT_RESOLVED", run, payload: ok ? response.payload : null, ...failure });
   notice?.remove();
   if (!result) {
     return false;
   }
-  // Deleted or hidden on B站 (as the 分拣台 and 摘读记录 tell it): no retry will bring it back. Else a send tries again.
-  const gone = !ok && MdgSites.isBiliVideoGone(response?.code);
-  const text = gone ? VIDEO_GONE : `读取原${sourceKind()}失败：${MdgErrors.text(response)}`;
-  const remedy = !ok && MdgErrors.remedies(response?.code).includes("retry") ? contextRemedy(contextRef) : null;
-  lastContextFailure = ok ? null : { run, text: silent ? "" : text, gone, remedy };
   updateContextChip();
   syncSendUi();
   if (ok) {
@@ -1736,15 +1730,18 @@ async function hydratePinnedConversationContext({ silent = false, notice = null
     suggestionsNode?.replaceChildren();
   }
   if (!silent) {
-    showConversationContextError(text, lastContextFailure.remedy);
+    showConversationContextError(failure.text, contextRemedy());
   }
   return false;
 }
 
-// What helps a saved conversation whose video failed to load (not gone): a site read only from its page (YouTube)
-// needs that page open, so 打开视频 opens it in this tab as the chip does; any other gets 重试 (B站限流, the network).
-// Either reads it again, and takes the error down once it loads.
-function contextRemedy(contextRef) {
+// What helps the shown conversation whose video failed to load (by its code; nothing when gone): a site read only
+// from its page (YouTube) needs that page open, so 打开视频 opens it in this tab as the chip does; any other gets 重试
+// (B站限流, the network). Either reads it again, and takes the error down once it loads.
+function contextRemedy() {
+  const { failed, pinned } = state.view();
+  if (!MdgErrors.remedies(failed.code).includes("retry")) return null;
+  const { contextRef } = pinned;
   const again = async () => {
     if (await hydratePinnedConversationContext()) removeCenteredState();
   };
diff --git a/extension/sidepanel.selftest.js b/extension/sidepanel.selftest.js
index b4cfe07..c7336f3 100644
--- a/extension/sidepanel.selftest.js
+++ b/extension/sidepanel.selftest.js
@@ -580,13 +580,13 @@ const tick = () => new Promise((r) => setImmediate(r));
     // J7: a failure that may pass (a limit, the network) gets 重试, as the tab's own read does; a gone video none. The
     // 重试 reads it again and takes the error down once it loads.
     assert.deepStrictEqual(remedies, ["", "重试", "重试"]);
-    const failure = vm.runInContext("contextFailure()", ctx);
-    assert.strictEqual(failure.remedy.label, "重试", "a redraw shows it again");
+    const remedy = vm.runInContext("contextRemedy()", ctx);
+    assert.strictEqual(remedy.label, "重试", "a redraw shows it again");
     let centered = 0;
     const realRemove = ctx.removeCenteredState;
     ctx.removeCenteredState = () => centered++;
     ctx.resolveConversationContext = async () => ({ ok: true, payload: video });
-    await failure.remedy.run();
+    await remedy.run();
     assert.deepStrictEqual([centered, view().resolved?.videoId], [1, video.videoId]);
     ctx.removeCenteredState = realRemove;
     // J12: a YouTube video reads only from its page: the remedy opens it (in this tab, as the chip does), then reads.
@@ -601,7 +601,7 @@ const tick = () => new Promise((r) => setImmediate(r));
     const steps = [];
     ctx.openCurrentContextUrl = async () => steps.push("open");
     ctx.resolveConversationContext = async () => (steps.push("read"), { ok: false, error: "x" });
-    await vm.runInContext("contextFailure()", ctx).remedy.run();
+    await vm.runInContext("contextRemedy()", ctx).run();
     assert.deepStrictEqual(steps, ["open", "read"]);
     ctx.openCurrentContextUrl = realOpen;
     errors.length = remedies.length = 0;