KeyError: 'JOIN' when parsing a query

[giacomochiarella]

Using the following code:

from sql_metadata import Parser

sql = """
select 
        dependent_schema.name as dependent_schema,
        relationships.dependent_name as dependent_name
from relationships
    join schema as dependent_schema on relationships.dependent_schema_id=dependent_schema.id
    join schema as referenced_schema on relationships.referenced_schema_id=referenced_schema.id
    group by dependent_schema, dependent_name
    order by dependent_schema, dependent_name;
"""

parser = Parser(sql)
print(parser.tables)
print(parser.columns)
print(parser.columns_dict)

produces the following error:

['relationships', 'schema']
Traceback (most recent call last):
  File "/Users/giacomochiarella/github/dwh_dbt/fake_dataset.py", line 83, in <module>
    print(parser.columns)
  File "/Users/giacomochiarella/github/dwh_dbt/venv/lib/python3.9/site-packages/sql_metadata/parser.py", line 202, in columns
    columns_aliases_names=self.columns_aliases_names,
  File "/Users/giacomochiarella/github/dwh_dbt/venv/lib/python3.9/site-packages/sql_metadata/parser.py", line 326, in columns_aliases_names
    self._handle_column_alias_subquery_level_update(token=token)
  File "/Users/giacomochiarella/github/dwh_dbt/venv/lib/python3.9/site-packages/sql_metadata/parser.py", line 674, in _handle_column_alias_subquery_level_update
    self._add_to_columns_aliases_subsection(token=token)
  File "/Users/giacomochiarella/github/dwh_dbt/venv/lib/python3.9/site-packages/sql_metadata/parser.py", line 740, in _add_to_columns_aliases_subsection
    section = COLUMNS_SECTIONS[keyword]
KeyError: 'JOIN'

if I comment the first selected column (dependent_schema.name as dependent_schema,) or I comment the first join (join schema as dependent_schema on relationships.dependent_schema_id=dependent_schema.id) I don't get any error. I know the query does make much sense, but the sql code should be syntactically correct. Anyone can help me?