Fix lamarzocco brewing start time sensor availability (#153732)

homeassistant/components/lamarzocco/sensor.py

@@ -5,7 +5,7 @@ from dataclasses import dataclass
 from datetime import datetime
 from typing import cast
 
-from pylamarzocco.const import BackFlushStatus, ModelName, WidgetType
+from pylamarzocco.const import BackFlushStatus, MachineState, ModelName, WidgetType
 from pylamarzocco.models import (
     BackFlush,
     BaseWidgetOutput,
@@ -97,7 +97,14 @@ ENTITIES: tuple[LaMarzoccoSensorEntityDescription, ...] = (
             ).brewing_start_time
         ),
         entity_category=EntityCategory.DIAGNOSTIC,
-        available_fn=(lambda coordinator: not coordinator.websocket_terminated),
+        available_fn=(
+            lambda coordinator: not coordinator.websocket_terminated
+            and cast(
+                MachineStatus,
+                coordinator.device.dashboard.config[WidgetType.CM_MACHINE_STATUS],
+            ).status
+            is MachineState.BREWING
+        ),
     ),
     LaMarzoccoSensorEntityDescription(
         key="steam_boiler_ready_time",

tests/components/lamarzocco/snapshots/test_sensor.ambr

@@ -45,7 +45,7 @@
     'last_changed': <ANY>,
     'last_reported': <ANY>,
     'last_updated': <ANY>,
-    'state': '2025-05-07T18:04:20+00:00',
+    'state': 'unavailable',
   })
 # ---
 # name: test_sensors[sensor.gs012345_coffee_boiler_ready_time-entry]