fishing rod had unbreaking 3, mending, luck of the sea 3, lure 2 and curse of vanishing. I was wearing unenchanted iron armour only on singleplayer. I left my computer as my player was afk fishing (with an auto clicker) for about twenty minutes and came back before finding the rod gone without a trace. this also happened with an unenchanted rod after leaving it for about 5 mins before but I assumed it was because of durability.