[YouTube-API] GData API change on playlist data? "Summary" tag no longer exists in playlist API returned data.

I am referring to this document: 

http://code.google.com/apis/youtube/2.0/developers_guide_protocol_playlists.html#Retrieving_a_playlist

And it says: "If the playlist owner defined a custom description for the video, that description will appear in a <summary> tag. The <summary> tag is a subtag of the <entry>tag. The <media:description> tag contains the video's original description."

Also, I have tested this API weeks ago, and this "summary" information is there. Based on this data field is published and working, I start my app's development. But today, when I finally test my half-done app with this API again, this "summary" data field is gone! Both production and stage API server are tested, and the results are the same.

I am wondering if there is an ongoing API change to drop this field? Or just something is simply wrong ;-(

For reproduction, this playlist feed can be used(it is a public playlist, no auth needed):

https://gdata.youtube.com/feeds/api/playlists/1A3B76F7FD82C1A8?v=2

and to view the playlist in browser, this URL can be used(it only contains one video, with "{"title": "this is a test entry"}" as its note, which should be contained "summary" tags in the response of the above playlist API call):

http://www.youtube.com/playlist?list=PL1A3B76F7FD82C1A8&

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