diff --git a/homeassistant/core.py b/homeassistant/core.py
index f8540ae7e70..f94a7d4c1bb 100644
--- a/homeassistant/core.py
+++ b/homeassistant/core.py
@@ -1680,11 +1680,15 @@ class State:
     @cached_property
     def last_changed_timestamp(self) -> float:
         """Timestamp of last change."""
+        if self.last_changed == self.last_updated:
+            return self.last_updated_timestamp
         return self.last_changed.timestamp()
 
     @cached_property
     def last_reported_timestamp(self) -> float:
         """Timestamp of last report."""
+        if self.last_reported == self.last_updated:
+            return self.last_updated_timestamp
         return self.last_reported.timestamp()
 
     @cached_property