diff --git a/homeassistant/data_entry_flow.py b/homeassistant/data_entry_flow.py
index 7d2ef09ecb8..f7be891b61b 100644
--- a/homeassistant/data_entry_flow.py
+++ b/homeassistant/data_entry_flow.py
@@ -666,7 +666,7 @@ class FlowHandler(Generic[_FlowContextT, _FlowResultT, _HandlerT]):
                 new_section_key = copy.copy(key)
                 schema[new_section_key] = val
                 val.schema = self.add_suggested_values_to_schema(
-                    copy.deepcopy(val.schema), suggested_values[key]
+                    val.schema, suggested_values[key]
                 )
                 continue
 
diff --git a/tests/test_data_entry_flow.py b/tests/test_data_entry_flow.py
index a2f4ad6e097..86ba5257001 100644
--- a/tests/test_data_entry_flow.py
+++ b/tests/test_data_entry_flow.py
@@ -178,6 +178,10 @@ async def test_form_shows_with_added_suggested_values(manager: MockFlowManager)
     assert markers[2] == "section_1"
     section_validator = form["data_schema"].schema["section_1"]
     assert isinstance(section_validator, data_entry_flow.section)
+    # The section class was not replaced
+    assert section_validator is schema.schema["section_1"]
+    # The section schema was not replaced
+    assert section_validator.schema is schema.schema["section_1"].schema
     section_markers = list(section_validator.schema.schema)
     assert len(section_markers) == 1
     assert section_markers[0] == "full_name"