It used to be before build 12.0.0;3218 that healing pads wouldnt heal any other party members that recently joined your party, whether through a bug not recognizing they existed or not implemented in the game, an update made it so your party members and ally will instantly be healed with you if its a MP/HP (both intertwined) type of healing pad, it should be noted however that healing pads will not restore your potions, so make sure if a healing pads nearby that you conserve your potions and run towards it, or run back to it.