It should have been heard on 18/5 according to this:
"In relation to each round of Championship, League 1, iProSport Cup or Challenge Cup matches solely involving Championship or League 1 teams, or Academy matches, the Panel meet on the Thursday following the Round in question and consider any incidents that have been reported by Match Officials or otherwise brought to the attention of the Panel."
Also, EGP was available so I would have expected him to use it for the Rochdale match had he been guilty.