Fix WWLLN entity management (#26250)

* added debug logging

* fixed manager to keep track of managed external ids

homeassistant/components/wwlln/geo_location.py

@@ -88,6 +88,7 @@ class WWLLNEventManager:
     @callback
     def _create_events(self, ids_to_create):
         """Create new geo location events."""
+        _LOGGER.debug("Going to create %s", ids_to_create)
         events = []
         for strike_id in ids_to_create:
             strike = self._strikes[strike_id]
@@ -106,6 +107,7 @@ class WWLLNEventManager:
     @callback
     def _remove_events(self, ids_to_remove):
         """Remove old geo location events."""
+        _LOGGER.debug("Going to remove %s", ids_to_remove)
         for strike_id in ids_to_remove:
             async_dispatcher_send(self._hass, SIGNAL_DELETE_ENTITY.format(strike_id))
 
@@ -136,12 +138,17 @@ class WWLLNEventManager:
             return
 
         new_strike_ids = set(self._strikes)
+        # Remove all managed entities that are not in the latest update anymore.
         ids_to_remove = self._managed_strike_ids.difference(new_strike_ids)
         self._remove_events(ids_to_remove)
 
+        # Create new entities for all strikes that are not managed entities yet.
         ids_to_create = new_strike_ids.difference(self._managed_strike_ids)
         self._create_events(ids_to_create)
 
+        # Store all external IDs of all managed strikes.
+        self._managed_strike_ids = new_strike_ids
+
 
 class WWLLNEvent(GeolocationEvent):
     """Define a lightning strike event."""