DB pattern matching not working as expected

[adimaggio2021]

I'm writing a function with a realtime DB trigger.

@db_fn.on_value_created(reference="/messages/{user}/{chat_id}/{msg_id}")
def do_work(event: db_fn.Event[Any]) -> None:
    # process event

From reading the docs, I expect this to match on a message pushed to a chat with chat_id. For example, a value created at /messages/user_1/chat_1/msg_a would be captured and the appropriate ids sent to the function.

However, when I attempt to implement this functionality, errors crop up in the pattern matching code:

File "/layers/google.python.pip/pip/lib/python3.11/site-packages/firebase_functions/private/path_pattern.py", line 177, in extract_matches
    matches[segment.trimmed] = path_segments[path_ndx]
                               ~~~~~~~~~~~~~^^^^^^^^^^
IndexError: list index out of range

It seems like the pattern-matching code errors out in this situation where the value created is at a ref with a wildcard in the last path segment. I'm using a workaround right now but thought I'd bring it up as an issue.