diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index 21b3a0c033702..9702a5b374356 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -3718,6 +3718,10 @@ def _getitem_bool_array(self, key):
         # check_bool_indexer will throw exception if Series key cannot
         # be reindexed to match DataFrame rows
         key = check_bool_indexer(self.index, key)
+
+        if key.all():
+            return self.copy(deep=None)
+
         indexer = key.nonzero()[0]
         return self._take_with_is_copy(indexer, axis=0)
 
@@ -6418,7 +6422,7 @@ def drop_duplicates(
         4  Indomie  pack     5.0
         """
         if self.empty:
-            return self.copy()
+            return self.copy(deep=None)
 
         inplace = validate_bool_kwarg(inplace, "inplace")
         ignore_index = validate_bool_kwarg(ignore_index, "ignore_index")
diff --git a/pandas/tests/copy_view/test_methods.py b/pandas/tests/copy_view/test_methods.py
index f5c7b31e59bc5..b3be215bcf000 100644
--- a/pandas/tests/copy_view/test_methods.py
+++ b/pandas/tests/copy_view/test_methods.py
@@ -322,10 +322,11 @@ def test_head_tail(method, using_copy_on_write):
     tm.assert_frame_equal(df, df_orig)
 
 
-def test_assign(using_copy_on_write):
+@pytest.mark.parametrize("method", ["assign", "drop_duplicates"])
+def test_assign_drop_duplicates(using_copy_on_write, method):
     df = DataFrame({"a": [1, 2, 3]})
     df_orig = df.copy()
-    df2 = df.assign()
+    df2 = getattr(df, method)()
     df2._mgr._verify_integrity()
 
     if using_copy_on_write: