The `__enter__()` call at line 189 sets `scope.span = self.graphql_span` and stores the previous span for restoration. However, if an exception is thrown at the `yield` point (line 196), the code after yield including `__exit__()` (line 204) will not execute. This leaves the scope in a corrupted state where `scope.span` still points to the graphql_span, and the span is never finished. The old code used `finish()` which also wouldn't run on exception, but it didn't call `__enter__()` to modify scope, so no scope corruption occurred.