diff --git a/homeassistant/components/diagnostics/util.py b/homeassistant/components/diagnostics/util.py
index dfb6bea7a21..f579dc1c010 100644
--- a/homeassistant/components/diagnostics/util.py
+++ b/homeassistant/components/diagnostics/util.py
@@ -2,7 +2,6 @@
 from __future__ import annotations
 
 from collections.abc import Iterable, Mapping
-from copy import deepcopy
 from typing import Any, TypeVar
 
 from homeassistant.core import callback
@@ -18,17 +17,17 @@ def async_redact_data(data: T, to_redact: Iterable[Any]) -> T:
     if not isinstance(data, (Mapping, list)):
         return data
 
-    redacted = deepcopy(data)
-
-    if isinstance(redacted, dict):
-        for key, value in redacted.items():
-            if key in to_redact:
-                redacted[key] = REDACTED
-            elif isinstance(value, dict):
-                redacted[key] = async_redact_data(value, to_redact)
-            elif isinstance(value, list):
-                redacted[key] = [async_redact_data(item, to_redact) for item in value]
-    elif isinstance(redacted, list):
+    if isinstance(data, list):
         return [async_redact_data(val, to_redact) for val in data]
 
+    redacted = {**data}
+
+    for key, value in redacted.items():
+        if key in to_redact:
+            redacted[key] = REDACTED
+        elif isinstance(value, dict):
+            redacted[key] = async_redact_data(value, to_redact)
+        elif isinstance(value, list):
+            redacted[key] = [async_redact_data(item, to_redact) for item in value]
+
     return redacted