According to [this MSO Q&A][1], when a migration is rejected, answers which were migrated along with the question are deleted. The reason for this is that the answers are [returned to the source site][2], where the question could potentially be reopened or sent elsewhere.


  [1]: http://meta.stackexchange.com/a/138460/189912
  [2]: http://meta.stackexchange.com/a/126982/189912