listen_log requires log parameter (doesn't default to all logs as documented)

[danVnest]

What happened?

The documentation says listen_log's log parameter is optional:

Name of the log to listen to, default is all logs. The name should be one of the 4 built in types main_log, error_log, diag_log or access_log or a user defined log entry.

However, it only seems to work when a specific log type is provided.

For example:
log_listeners = self.listen_log(self.handle_logged_issue, "WARNING") never triggers the callback, but
log_listeners = self.listen_log(self.handle_logged_issue, "WARNING", log="main_log") triggers the callback as expected

Side note: the documentation says listen_log returns "a handle", but it returns a list of handles. The examples also imply only a single handle is returned.

Version

4.5.13

Installation type

Home Assistant add-on

Relevant log output

Relevant code in the app or config file that caused the issue

I have tested with the following in appdaemon.yaml:

logs:
  main_log:
    filename: /config/logs/main.log
    filter_threshold: 5
  error_log:
    filename: /config/logs/errors.log
  diag_log:
    filename: /config/logs/diag.log
  access_log:
    filename: /config/logs/access.log

and also with all of that omitted (logging to STDOUT by default, showing in Home Assistant's app logs).

Anything else?

I'm happy to provide example code and logs if you can't replicate this.