Avoid overly careful runZoneGuarded

docs/pubspec.yaml

@@ -41,6 +41,7 @@ dev_dependencies:
   drift_dev:
 
 dependency_overrides:
+  # Waiting for dartdoc, https://github.com/dart-lang/dartdoc/pull/3033
   analyzer: ^4.0.0
   moor:
     path: ../moor

drift/lib/src/runtime/cancellation_zone.dart

@@ -12,9 +12,8 @@ CancellationToken<T> runCancellable<T>(
   Future<T> Function() operation,
 ) {
   final token = CancellationToken<T>();
-  runZonedGuarded(
-    () => operation().then(token._resultCompleter.complete),
-    token._resultCompleter.completeError,
+  runZoned(
+    () => token._resultCompleter.complete(Future.sync(operation)),
     zoneValues: {_key: token},
   );