Christ's wounds were in fact not healed
Christ’s wounds were in fact not healed. He’s got them now, in Heaven. He had them when He appeared to the disciples; they’re part of the imitation of Christ by the stigmatic saints. God heals some wounds. Others, He glorifies. He transforms them in some way we can’t necessarily imagine beforehand, just as we can’t quite imagine what it will mean for our flesh to be glorified in the Resurrection.