Wrong steps list if call execute_steps() multiple times

[StpMax]

q = '''
    SELECT m.amount, m.weekly
    FROM example_db.data_big AS t JOIN mindsdb.byomp AS m
    WHERE t.weekly > 1 USING a=1
'''
ast = parse_sql(q, dialect='mindsdb')

planner = query_planner.QueryPlanner(
    ast,
    integrations=[{'name': 'example_db', 'type': 'data'}],
    predictor_metadata=[{'name': 'byomp', 'integration_name': 'mindsdb', 'timeseries': False}],
    default_namespace='mindsdb'
)
list(planner.execute_steps())
print(list(planner.execute_steps()))

in output each step will be 2 times.