My character lost all their skills and inventory after porting to another player. Even quest progress was gone, as I saw quest givers for quests I completed (I still had my mount and my unassigned skill points). I relogged, and luckily it restored most things. However, my skills were still unassigned to the hot bar (but assigned as skills) and I lost all wayshrines, even the ones you should always have unlocked (like the basic one in each DLC).