MentionedEvent does not indicate who or what was mentioned

"Represents a 'mentioned' event on a given issue or pull request."
type MentionedEvent implements Node {
  "Identifies the actor who performed the event."
  actor: Actor
  "Identifies the date and time when the object was created."
  createdAt: DateTime!
  "Identifies the primary key from the database."
  databaseId: Int
  id: ID!

That doesn’t really make it any more useful than the “Comment” event we receive immediately preceeding it. 

It also does not indicate the original comment containing the message, which makes it difficult to try and manually resolve this ourselves with any degree of certainty. The best assumption we can make is that the immediately preceeding Comment event is what contains the mention, but that’s just a best guess and feels kind of sloppy.