The bug produced when use signAndSend or estimateFees in apiTx.
I/flutter (22736): #0 ApiTx.signAndSend (package:polkawallet_sdk/api/apiTx.dart:53:7)I/flutter (22736): #1
I/flutter (22736):
I/flutter (22736): type ‘Future<Map<dynamic, dynamic>?>’ is not a subtype of type ‘FutureOr<Map<dynamic, dynamic>>’ in type cast
The bug produced when use signAndSend or estimateFees in apiTx.