Listenbrainz: no permanent storage of items

Hi emms-users,

there is a small/big problem with the listenbrainz code: the items are 
not store in the permanent storage of listenbrainz.

If I am not wrong, the reason is very easy to find:
https://listenbrainz.readthedocs.io/en/latest/users/json.html#json-doc

The second note on this page says:

Playing Now listens are only stored temporarily. A playing now listen 
must be submitted again as a single or import for permanent storage.

In the definition of 
emms-listenbrainz-scrobbler-make-async-submission-call I see the following:

(defun emms-listenbrainz-scrobbler-make-async-submission-call (track 
&optional playing-now)

Problaby the issue is related to the optional argument playing-now, but 
I have no idea.

Any ideas?

Best,