If using NAL aligment and only dropping part of the AU, the size
argument given to gst_base_parse_finish_frame was wrong and this assert
in gst_base_parse_finish_frame hit
'gst_adapter_available (parse->priv->adapter) >= size' failed
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8976>