Commit 4fc52529

@@ -439,7 +439,7 @@ class ChatCompletionStreamState(Generic[ResponseFormatT]):
                 and not choice_snapshot.message.refusal
                 and is_given(self._rich_response_format)
                 # partial parsing fails on white-space
-                and choice_snapshot.message.content.strip()
+                and choice_snapshot.message.content.lstrip()
             ):
                 choice_snapshot.message.parsed = from_json(
                     bytes(choice_snapshot.message.content, "utf-8"),