Example search:
https://api.twitter.com/1.1/search/tweets.json?q="I%20love%20Tom%20Cat"%20from%3Amizannagda
The status with id_str “710145182126084097” is a retweet of a quoted tweet, but retweeted_status.quoted_status.user is missing. When fetching the status from /show/710145182126084097.json the retweeted_status.quoted_status.user property is populated as expected.