diff --git a/fastapi/_compat.py b/fastapi/_compat.py
index 7efab007a..3ed881264 100644
--- a/fastapi/_compat.py
+++ b/fastapi/_compat.py
@@ -616,8 +616,6 @@ def field_annotation_is_scalar_sequence(annotation: Union[Type[Any], None]) -> b
             if field_annotation_is_scalar_sequence(arg):
                 at_least_one_scalar_sequence = True
                 continue
-            elif not field_annotation_is_scalar(arg):
-                return False
         return at_least_one_scalar_sequence
     return field_annotation_is_sequence(annotation) and all(
         field_annotation_is_scalar(sub_annotation)