Multiple Optional return values cause irregular formatting for custom column_limit

The yapf configuration:
```
[yapf]
based_on_style = pep8
column_limit = 120
SPLIT_BEFORE_LOGICAL_OPERATOR = true
BLANK_LINE_BEFORE_NESTED_CLASS_OR_DEF = true
SPLIT_COMPLEX_COMPREHENSION = true
SPLIT_BEFORE_BITWISE_OPERATOR = true
SPLIT_BEFORE_ARITHMETIC_OPERATOR = true
SPLIT_ALL_COMMA_SEPARATED_VALUES = true
```

Python 3.9.5
Yapf 0.31.0

When using Optional return values, it seems the custom column limit is ignored. The following is working correctly, because it's under 80 characters.

```
def _retrieve_something_from_db(db_connection: DatabaseConnect,
start: date,
end: date) -> Tuple[Optional[datetime],
Optional[datetime],
Optional[datetime]]:
```

This should work with column limit 120,

```
def _retrieve_something_very_important_from_database(db_connection: DatabaseConnect,
start: date,
end: date) -> Tuple[Optional[datetime],
Optional[datetime],
Optional[datetime]]:
```

but is formatted like this:

```
def _retrieve_something_very_important_from_database(
db_connection: DatabaseConnect,
start: date,
end: date) -> Tuple[Optional[datetime],
Optional[datetime],
Optional[datetime]]:
```

This only happens when we use MULTIPLE Optional keywords.

CORRECTION:
It happens more often. Also with regular function calls without optional arguments.