API.getBulkRequest returns null with callback Parameter

Hi,

when I use the getBulkRequest Method with Matomo 4.1.1 and append the &callback or &jsoncallback Parameter, the array values in the response will always be null. This used to work with matomo 3.14.0

Example URL:

/?module=API
&method=API.getBulkRequest
&format=json
&token_auth=xxxx
&urls[0]=method=VisitsSummary.getVisits
&jsoncallback=ng_jsonp_callback_0
&idSite=6

Example Response:
ng_jsonp_callback_0([null])

Thanks for your support,
Patrick

This seems a lot like a bug: