Fix cache test - get_current_state returns copies for safety

The cache stores the state, but get_current_state() returns a copy
to prevent external mutation. Check equality, not identity.

Author: Spacehunterz

tests/test_event_log_dispatch.py

@@ -727,8 +727,9 @@ def test_cache_actually_caches(self):
             state2 = el.get_current_state(use_cache=True)
             assert state1 == state2, "Cached and non-cached states should be equal"
 
-            # Verify cache is actually being used (same object identity)
-            assert el._state_cache is state2, "Cache should return same object"
+            # Verify cache is actually being used (returns equal data)
+            # Note: get_current_state returns a copy for safety, so identity differs
+            assert el._state_cache == state2, "Cache should contain same data"
 
             # Now invalidate cache by adding another event
             el.append_event("finding.added", {