fix: Apply debounce to messages without payload (#32791)

Co-authored-by: ChillZwix <ChillZwix@users.noreply.github.com>

lib/extension/receive.ts

@@ -180,8 +180,11 @@ export default class Receive extends Extension {
 
         if (!utils.objectIsEmpty(payload)) {
             await publish(payload);
-        } else {
-            await utils.publishLastSeen({device: data.device, reason: "messageEmitted"}, settings.get(), true, this.publishEntityState);
+        } else if (settings.get().advanced.last_seen && settings.get().advanced.last_seen !== "disable") {
+            // A message was received that produced no payload (e.g. a frame the converter has no data
+            // for). Publish through the regular publish() path so the per-device debounce/throttle
+            // still applies, instead of publishing the full cached state immediately via publishLastSeen.
+            await publish({});
         }
     }
 }

test/extensions/receive.test.ts

@@ -190,6 +190,30 @@ describe("Extension: Receive", () => {
         expect(mockMQTTPublishAsync.mock.calls[1][0]).toStrictEqual("zigbee2mqtt/bridge/health");
     });
 
+    it("Should not bypass the debounce when a message produces no payload", async () => {
+        const device = devices.WSDCGQ11LM;
+        settings.set(["devices", device.ieeeAddr, "debounce"], 0.1);
+        settings.set(["advanced", "last_seen"], "ISO_8601");
+        // Attribute report without measuredValue: the lumi_temperature converter returns nothing.
+        const payload = {
+            data: {},
+            cluster: "msTemperatureMeasurement",
+            device,
+            endpoint: device.getEndpoint(1),
+            type: "attributeReport",
+            linkquality: 10,
+        };
+        await mockZHEvents.message(payload);
+        await flushPromises();
+        // The empty payload must not be published immediately (bypassing the debounce).
+        vi.advanceTimersByTime(50);
+        expect(mockMQTTPublishAsync).toHaveBeenCalledTimes(0);
+        vi.runOnlyPendingTimers();
+        await flushPromises();
+        expect(mockMQTTPublishAsync).toHaveBeenCalledTimes(2);
+        expect(mockMQTTPublishAsync.mock.calls[0][0]).toStrictEqual("zigbee2mqtt/weather_sensor");
+    });
+
     it("Should debounce and retain messages when set via device_options", async () => {
         const device = devices.WSDCGQ11LM;
         settings.set(["device_options", "debounce"], 0.1);