Container object listing shows wrong size for manifest files (large object support)

The object listing in a container shows file size 0 for a manifest file (large object support: http://swift.openstack.org/overview_large_objects.html).

Example:

curl -k -H "X-Auth-Token: AUTH_tkc75cc6d14b364be2a5a1fb0a63ce795e" https://swift-proxy/v1/AUTH_7aa910fbd9c146ebbfbf8fa14665f343/miniserver-snapshots/?format=json | tr ',' '\n'
[{"name":"af44a405582f4ad4802db815684d492a.2011-10-14-10-28-53.part/1"
"hash":"7fc06487df4b25feb6ff831529b58a5f"
"bytes":1073741824
"content_type":"application/octet-stream"
 "last_modified":"2011-10-14T10:28:53.040560"}
{"name":"af44a405582f4ad4802db815684d492a.2011-10-14-10-28-53.part/2"
"hash":"1c7c1d7b97a411eb53efbbf61a5f3fe2"
"bytes":1073741824
"content_type":"application/octet-stream"
 "last_modified":"2011-10-14T10:32:03.069810"}
{"name":"af44a405582f4ad4802db815684d492a.2011-10-14-10-28-53.part/3"
"hash":"a0143efeb39d82806dbffd790312824e"
"bytes":1073741824
"content_type":"application/octet-stream"
 "last_modified":"2011-10-14T10:35:54.516930"}
{"name":"af44a405582f4ad4802db815684d492a.2011-10-14-10-28-53.part/4"
"hash":"e1e8e4082e225a2af80f54740a299de5"
"bytes":630096023
"content_type":"application/octet-stream"
 "last_modified":"2011-10-14T10:40:30.890310"}
{"name":"af44a405582f4ad4802db815684d492a.2011-10-14-10-28-53.raw.gz"
"hash":"d41d8cd98f00b204e9800998ecf8427e"
"bytes":0
"content_type":"x-application/x-gzip"
 "last_modified":"2011-10-14T10:48:12.588660"}]

The manifest file (af44a405582f4ad4802db815684d492a.2011-10-14-10-28-53.raw.gz) shows 0 bytes in the listing, but the GET/HEAD requests report the right size (the sum of all 4 parts in this example):

curl -I -k -H "X-Auth-Token: AUTH_tkc75cc6d14b364be2a5a1fb0a63ce795e" https://swift-proxy/v1/AUTH_7aa910fbd9c146ebbfbf8fa14665f343/miniserver-snapshots/af44a405582f4ad4802db815684d492a.2011-10-14-10-28-53.raw.gz
HTTP/1.1 200 OK
X-Object-Manifest: miniserver-snapshots/af44a405582f4ad4802db815684d492a.2011-10-14-10-28-53.part
Content-Type: x-application/x-gzip
Content-Length: 3851321495
Last-Modified: Fri, 14 Oct 2011 10:40:30 GMT
Etag: "eafa4a9622e181933435f4abbcfc548c"
Accept-Ranges: bytes
Date: Fri, 14 Oct 2011 11:55:28 GMT

It doesn't matter if the output it's in JSON or XML format, the size is always 0.

This is swift 1.4.3.