The manual `__enter__()` and `__exit__(None, None, None)` calls lack exception safety. If an exception is thrown into the generator at the `yield` point, the code after `yield` (including `__exit__`) won't execute, leaving the span unclosed and the scope in an inconsistent state (scope.span still points to this span). Additionally, always passing `(None, None, None)` to `__exit__` means any exception that does reach that code won't be recorded on the span's status.