diff --git a/conan/api/model/list.py b/conan/api/model/list.py
index 8faedec405d..6cdc38c3858 100644
--- a/conan/api/model/list.py
+++ b/conan/api/model/list.py
@@ -225,12 +225,13 @@ def split(self):
             result.append(subpkglist)
         return result
 
-    def only_recipes(self):
-        result = {}
+    def only_recipes(self) -> None:
+        """ Filter out all the packages and package revisions, keep only the recipes and
+            recipe revisions in self.recipes.
+        """
         for ref, ref_dict in self.recipes.items():
             for rrev_dict in ref_dict.get("revisions", {}).values():
                 rrev_dict.pop("packages", None)
-        return result
 
     def add_refs(self, refs):
         # RREVS alreday come in ASCENDING order, so upload does older revisions first
diff --git a/test/unittests/model/test_list.py b/test/unittests/model/test_list.py
new file mode 100644
index 00000000000..96799f43afa
--- /dev/null
+++ b/test/unittests/model/test_list.py
@@ -0,0 +1,49 @@
+from conan.api.model import PackagesList
+
+
+def test_package_list_only_recipes():
+    pl = PackagesList()
+    pl.recipes = {
+        "foobar/0.1.0": {'revisions':
+                             {'85eb0587a3c12b90216c72070e9eef3e':
+                                  {'timestamp': 1740151190.975,
+                                   'packages': {'c29f32beda3c361f536ba35aae5e876faf970169':
+                                       {'revisions': {
+                                           '9a0569c04839fff6a6e8f40e10434bc6':
+                                               {'timestamp': 1742417567.684486}},
+                                           'info': {}}}}}},
+        "qux/0.2.1": {'revisions':
+                          {'71c3c11b98a6f2ae11f0f391f5e62e2b':
+                               {'timestamp': 1740151186.976, 'packages':
+                                   {'13be611585c95453f1cbbd053cea04b3e64470ca':
+                                        {'revisions': {'5c7e0c0788cd4d89249ad251f0868787':
+                                                           {'timestamp': 1740152032.884}},
+                                         'info':
+                                             {'settings':
+                                                  {'arch': 'x86_64',
+                                                   'build_type': 'Release',
+                                                   'compiler': 'gcc',
+                                                   'compiler.cppstd': '17',
+                                                   'compiler.libcxx': 'libstdc++11',
+                                                   'compiler.version': '11', 'os': 'Linux'},
+                                              'options': {'fPIC': 'True', 'shared': 'False'}}},
+                                    '30652ea35b512fa3fe0f4dcd39ad217e4e60bd01':
+                                        {'revisions': {'8f363f1d95ad766ac400e1f1f5406599':
+                                                           {'timestamp': 1741861639.2198145}},
+                                         'info': {}},
+                                    'fc491156b442836722612d1aa8a8c57e406447b6':
+                                        {'revisions': {'62e9e2659596c97cd1dd313d4394e947':
+                                                           {'timestamp': 1740151900.394}},
+                                         'info': {
+                                             'settings':
+                                                 {'arch': 'x86_64', 'build_type': 'Release',
+                                                  'compiler': 'gcc', 'compiler.cppstd': '17',
+                                                  'compiler.libcxx': 'libstdc++11',
+                                                  'compiler.version': '11', 'os': 'Linux'},
+                                             'options': {'shared': 'True'}}}}}}}
+    }
+    pl.only_recipes()
+    assert pl.recipes == {'foobar/0.1.0': {
+        'revisions': {'85eb0587a3c12b90216c72070e9eef3e': {'timestamp': 1740151190.975}}},
+                       'qux/0.2.1': {'revisions': {
+                           '71c3c11b98a6f2ae11f0f391f5e62e2b': {'timestamp': 1740151186.976}}}}