nametag is gone in survival mode

i think nametag is gone from survival mode. even fishing with enchanted luck of the sea 3 still no nametag. i got many saddle tho or enchanted item. i explore the world, searching for treasures. but still no nametag found. so i gave up and use cheat to give me a nametag. i named it, apply it on my dog but after i quit and back to the game. the name is gone. i try it again and the same thing happen. this is not happen to me only, this happen to my brother survival world too