Unchecked Return Value of *scanf' rule not work in IDA 9.1

[JsHuang]

Hi, using the latest version in IDA 9.1 got errors:

The rule "{'name': 'Unchecked Return Value of *scanf', 'function_names': ['_isoc99_scanf', 'fscanf', 'scanf', 'sscanf', 'vfscanf', 'vfscanf_s', 'vfwscanf', 'vfwscanf_s', 'vscanf', 'vscanf_s', 'vsscanf', 'vsscanf_s', 'vswscanf', 'vswscanf_s', 'vwscanf', 'vwscanf_s'], 'wrappers': False, 'mark_if': {'High': 'not function_call.return_value_checked()', 'Medium': 'not function_call.return_value_checked(param_count - 2)', 'Low': 'False'}}" is not valid!

[Martyx00]

Hello, have you tested this on the same binary but with some earlier version? Also, if you remove this rule from the default rule set, does the error appear for any other rule?