See https://community.metabrainz.org/t/cant-load-an-album/388714/16?u=mineo. Picard 2 crashes with

D: 17:31:10,904 coverart.queue_put:206: Queuing cover art image CaaCoverArtImage(url='http://coverartarchive.org/release/95f96fa2-bbcc-4e3f-9f47-9322a8f81906/20260915655.jpg', types=['front', 'raw/unedited'], is_front=True)
Traceback (most recent call last):
File "./picard/webservice/_init_.py", line 426, in _process_reply
self._handle_reply(reply, request)
File "./picard/webservice/_init_.py", line 415, in _handle_reply
handler(reply.readAll(), reply, error)
File "./picard/coverart/providers/caa.py", line 376, in _caa_json_downloaded
self.next_in_queue()
File "./picard/coverart/providers/_init_.py", line 151, in next_in_queue
self.coverart.next_in_queue()
File "./picard/coverart/_init_.py", line 187, in next_in_queue
'type': coverartimage.types_as_string(),
File "./picard/coverart/image.py", line 354, in types_as_string
types = [translate_caa_type(type) for type in types]
File "./picard/coverart/image.py", line 354, in <listcomp>
types = [translate_caa_type(type) for type in types]
File "./picard/coverart/utils.py", line 42, in translate_caa_type
return gettext_attr(CAA_TYPES_TR[name], "cover_art_type")
KeyError: 'raw/unedited'

Picard 1.4 catches the exception somewhere but doesn't correctly update the album loading state.