The types set for the images on http://musicbrainz.org/release/6fa8a8bc-48aa-41ce-9fec-07f1d65bbaf6/cover-art are not reflected in the webservice call. The types of some images were changed, but the webservice still shows the old values.
The release does contain one image labeled front (http://coverartarchive.org/release/6fa8a8bc-48aa-41ce-9fec-07f1d65bbaf6/9289167679.jpg) and one labeled booklet (http://coverartarchive.org/release/6fa8a8bc-48aa-41ce-9fec-07f1d65bbaf6/9289171494.jpg). However the web service call shows the first image with no types and the second with both front and booklet.
Result of the webservice call as of time of writing this: