diff --git a/pytorch3d/implicitron/tools/config.py b/pytorch3d/implicitron/tools/config.py
index 431be1a5..821155a2 100644
--- a/pytorch3d/implicitron/tools/config.py
+++ b/pytorch3d/implicitron/tools/config.py
@@ -903,13 +903,17 @@ def expand_args_fields(
             processed_members.update(base._processed_members)
 
     to_process: List[Tuple[str, Type, _ProcessType]] = []
-    if "__annotations__" in some_class.__dict__:
-        for name, type_ in some_class.__annotations__.items():
-            underlying_and_process_type = _get_type_to_process(type_)
-            if underlying_and_process_type is None:
-                continue
-            underlying_type, process_type = underlying_and_process_type
-            to_process.append((name, underlying_type, process_type))
+    # Only this class's own annotations, never a base's. Reading
+    # some_class.__dict__["__annotations__"] used to express that, but under
+    # PEP 649 the entry is not in the class dict until something materializes
+    # it, so on 3.14 the lookup silently found nothing and no member was
+    # processed at all.
+    for name, type_ in inspect.get_annotations(some_class).items():
+        underlying_and_process_type = _get_type_to_process(type_)
+        if underlying_and_process_type is None:
+            continue
+        underlying_type, process_type = underlying_and_process_type
+        to_process.append((name, underlying_type, process_type))
 
     for name, underlying_type, process_type in to_process:
         processed_members[name] = some_class.__annotations__[name]