diff --git a/CHANGELOG.md b/CHANGELOG.md
index 929ebbe36a2..4e18080f2dc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -62,6 +62,7 @@ Docs: https://docs.openclaw.ai
 - Cron: keep long manual cron runs active in the task registry until completion, preventing transient `lost` markers before durable recovery reconciles. Fixes #78233. (#78243) Thanks @Feelw00.
 - Doctor/GitHub CLI: surface a `GH_CONFIG_DIR` hint when the GitHub skill is usable but `gh` auth lives under a different operator HOME than the agent process, without warning for disabled or filtered skills. Fixes #78063. (#78095) Thanks @tmimmanuel.
 - Gateway: dedupe concurrent `send`, `poll`, and `message.action` requests while delivery is still in flight, preventing duplicate outbound work for the same idempotency key. (#68341) Thanks @thesomewhatyou.
+- Cron: keep main-session `systemEvent` heartbeat wakes on their bound session route for both direct and queued wake paths by dropping inherited explicit heartbeat destinations when forcing `target: "last"`. Fixes #73900. Thanks @richardmqq.
 - Gateway: clear speculative node wake state when APNs registration is missing, preventing unregistered or mistyped node IDs from retaining wake throttle entries. Fixes #68847. (#68848) Thanks @Feelw00.
 - Auto-reply: keep late follow-up queue drain finalizers from deleting a replacement queue registered after `/stop`, preventing immediate follow-up messages from being orphaned. Fixes #68838. (#68839) Thanks @Feelw00.
 - Feishu: make manual App ID/App Secret setup the default channel-binding path while keeping QR scan-to-create as an optional best-effort flow, and document the manual fallback for domestic Feishu mobile clients that do not react to the QR code. Fixes #80591. Thanks @wei-wei-zhao.
diff --git a/src/gateway/server-cron.test.ts b/src/gateway/server-cron.test.ts
index e186ff89009..70eb3c42443 100644
--- a/src/gateway/server-cron.test.ts
+++ b/src/gateway/server-cron.test.ts
@@ -735,8 +735,7 @@ describe("buildGatewayCronService", () => {
       expect(agentHeartbeat.target).toBe("last");
       expect(agentHeartbeat.deliveryFormat).toBe("markdown");
       const heartbeat = requireRecord(options.heartbeat, "heartbeat override");
-      expect(heartbeat.target).toBe("last");
-      expect(heartbeat.deliveryFormat).toBe("markdown");
+      expect(heartbeat).toEqual({});
     } finally {
       state.cron.stop();
     }
diff --git a/src/gateway/server-cron.ts b/src/gateway/server-cron.ts
index c3a38b84484..22dd18a72f6 100644
--- a/src/gateway/server-cron.ts
+++ b/src/gateway/server-cron.ts
@@ -262,25 +262,6 @@ export function buildGatewayCronService(params: {
     },
     runHeartbeatOnce: async (opts) => {
       const { runtimeConfig, agentId, sessionKey } = resolveCronWakeTarget(opts);
-      // Merge cron-supplied heartbeat overrides (e.g. target: "last") with the
-      // fully resolved agent heartbeat config so cron-triggered heartbeats
-      // respect agent-specific overrides (agents.list[].heartbeat) before
-      // falling back to agents.defaults.heartbeat.
-      const agentEntry =
-        Array.isArray(runtimeConfig.agents?.list) &&
-        runtimeConfig.agents.list.find(
-          (entry) =>
-            entry && typeof entry.id === "string" && normalizeAgentId(entry.id) === agentId,
-        );
-      const agentHeartbeat =
-        agentEntry && typeof agentEntry === "object" ? agentEntry.heartbeat : undefined;
-      const baseHeartbeat = {
-        ...runtimeConfig.agents?.defaults?.heartbeat,
-        ...agentHeartbeat,
-      };
-      const heartbeatOverride = opts?.heartbeat
-        ? { ...baseHeartbeat, ...opts.heartbeat }
-        : undefined;
       return await runHeartbeatOnce({
         cfg: runtimeConfig,
         source: opts?.source ?? "cron",
@@ -288,7 +269,7 @@ export function buildGatewayCronService(params: {
         reason: opts?.reason,
         agentId,
         sessionKey,
-        heartbeat: heartbeatOverride,
+        heartbeat: opts?.heartbeat,
         deps: { ...params.deps, runtime: defaultRuntime },
       });
     },
diff --git a/src/infra/heartbeat-runner.scheduler.test.ts b/src/infra/heartbeat-runner.scheduler.test.ts
index ff3ee1c93b3..a494d7ba160 100644
--- a/src/infra/heartbeat-runner.scheduler.test.ts
+++ b/src/infra/heartbeat-runner.scheduler.test.ts
@@ -473,6 +473,8 @@ describe("startHeartbeatRunner", () => {
               prompt: "Ops prompt",
               directPolicy: "block",
               target: "discord:channel:ops",
+              to: "discord:dm:ops",
+              accountId: "ops-account",
             },
           },
         ]),
@@ -503,6 +505,49 @@ describe("startHeartbeatRunner", () => {
     runner.stop();
   });
 
+  it("keeps non-cron targeted wake destination overrides explicit", async () => {
+    useFakeHeartbeatTime();
+    const runSpy = vi.fn().mockResolvedValue({ status: "ran", durationMs: 1 });
+    const runner = await expectWakeDispatch({
+      cfg: {
+        ...heartbeatConfig([
+          {
+            id: "ops",
+            heartbeat: {
+              every: "15m",
+              target: "discord:channel:ops",
+              to: "discord:dm:ops",
+              accountId: "ops-account",
+            },
+          },
+        ]),
+      } as OpenClawConfig,
+      runSpy,
+      wake: {
+        source: "hook",
+        intent: "event",
+        reason: "hook:job-123",
+        agentId: "ops",
+        sessionKey: "agent:ops:discord:channel:alerts",
+        heartbeat: { target: "last" },
+        coalesceMs: 0,
+      },
+      expectedCall: {
+        agentId: "ops",
+        reason: "hook:job-123",
+        sessionKey: "agent:ops:discord:channel:alerts",
+        heartbeat: {
+          every: "15m",
+          target: "last",
+          to: "discord:dm:ops",
+          accountId: "ops-account",
+        },
+      },
+    });
+
+    runner.stop();
+  });
+
   it("clamps oversized scheduler delays so heartbeats do not fire in a tight loop (#71414)", async () => {
     useFakeHeartbeatTime();
     const runSpy = vi.fn().mockResolvedValue({ status: "ran", durationMs: 1 });
diff --git a/src/infra/heartbeat-runner.ts b/src/infra/heartbeat-runner.ts
index 7898b77b6b6..0b1fc018661 100644
--- a/src/infra/heartbeat-runner.ts
+++ b/src/infra/heartbeat-runner.ts
@@ -298,6 +298,34 @@ function resolveHeartbeatConfig(
   return { ...defaults, ...overrides };
 }
 
+function omitExplicitHeartbeatDestination(heartbeat: HeartbeatConfig | undefined) {
+  if (!heartbeat) {
+    return undefined;
+  }
+  const next = { ...heartbeat };
+  delete next.to;
+  delete next.accountId;
+  return next;
+}
+
+function resolveHeartbeatForWake(params: {
+  cfg: OpenClawConfig;
+  agentId: string;
+  configuredHeartbeat?: HeartbeatConfig;
+  requestedHeartbeat?: HeartbeatConfig;
+  source?: HeartbeatWakeSource;
+  mergeRequestedHeartbeat: boolean;
+}): HeartbeatConfig | undefined {
+  const base = params.configuredHeartbeat ?? resolveHeartbeatConfig(params.cfg, params.agentId);
+  const heartbeat =
+    params.requestedHeartbeat && params.mergeRequestedHeartbeat
+      ? { ...base, ...params.requestedHeartbeat }
+      : (params.requestedHeartbeat ?? base);
+  return params.source === "cron" && params.requestedHeartbeat?.target === "last"
+    ? omitExplicitHeartbeatDestination(heartbeat)
+    : heartbeat;
+}
+
 function resolveHeartbeatAgents(cfg: OpenClawConfig): HeartbeatAgent[] {
   const list = cfg.agents?.list ?? [];
   if (hasExplicitHeartbeatAgents(cfg)) {
@@ -1180,7 +1208,13 @@ export async function runHeartbeatOnce(opts: {
   const agentId = normalizeAgentId(
     explicitAgentId || forcedSessionAgentId || resolveDefaultAgentId(cfg),
   );
-  const heartbeat = opts.heartbeat ?? resolveHeartbeatConfig(cfg, agentId);
+  const heartbeat = resolveHeartbeatForWake({
+    cfg,
+    agentId,
+    requestedHeartbeat: opts.heartbeat,
+    source: opts.source,
+    mergeRequestedHeartbeat: opts.source === "cron",
+  });
   if (!areHeartbeatsEnabled()) {
     return { status: "skipped", reason: "disabled" };
   }
@@ -2183,8 +2217,6 @@ export function startHeartbeatRunner(opts: {
     const requestedAgentId = params?.agentId ? normalizeAgentId(params.agentId) : undefined;
     const requestedSessionKey = normalizeOptionalString(params?.sessionKey);
     const requestedHeartbeat = params?.heartbeat;
-    const resolveRequestedHeartbeat = (heartbeat?: HeartbeatConfig) =>
-      requestedHeartbeat ? { ...heartbeat, ...requestedHeartbeat } : heartbeat;
     const isInterval = reason === "interval";
     const startedAt = Date.now();
     const now = startedAt;
@@ -2208,7 +2240,14 @@ export function startHeartbeatRunner(opts: {
           const res = await runOnce({
             cfg: state.cfg,
             agentId: targetAgent.agentId,
-            heartbeat: resolveRequestedHeartbeat(targetAgent.heartbeat),
+            heartbeat: resolveHeartbeatForWake({
+              cfg: state.cfg,
+              agentId: targetAgent.agentId,
+              configuredHeartbeat: targetAgent.heartbeat,
+              requestedHeartbeat,
+              source: params.source,
+              mergeRequestedHeartbeat: true,
+            }),
             source: params.source,
             intent,
             reason,