Originally reported in https://github.com/localstack/localstack/issues/2099, the CreationTime for CF stacks was hardcoded. This was fixed in in LocalStack itself (https://github.com/localstack/localstack/pull/2103), but is now also fixed in moto (https://github.com/spulec/moto/pull/2818).

I don't know what version of moto you're using, and whether it's acceptable to use dev-releases, but if you do: 

moto 1.3.15.dev550 should fix this issue, so the LS fix can be removed if you upgrade :) 
param_defaults(
                    dump_json_params(
                        select_parameters('Path', 'RoleName', 'AssumeRolePolicyDocument',
                            'Description', 'MaxSessionDuration', 'PermissionsBoundary', 'Tags'),
                        'AssumeRolePolicyDocument'),
                    {'RoleName': PLACEHOLDER_RESOURCE_NAME})
        }
    },
    'ApiGateway::RestApi': {
        'create': {
            'function': 'create_rest_api',
            'parameters': {
                'name': 'Name',
                'description': 'Description'
            }
        }
    },
    'ApiGateway::Resource': {
        'create': {
            'function': 'create_resource',
            'parameters': {
                'restApiId': 'RestApiId',
                'pathPart': 'PathPart',
                'parentId': 'ParentId'
            }
        }
    },
    'ApiGateway::Method': {
        'create': {
            'function': 'put_method',