Can’t get name tags from fishing or chests with loot.

I've been fishing for a couple of irl days now but can't seem to get any nametags. My fishing rod is level 3 everything and I've even gotten 3 mending books so far. Yesterday I checked the wiki for all items you can get while fishing and I have at least 5 of each item possible to catch in the game. But I've noticed occasionally that when I reel in my line, there isn't anything caught. It's nothing. So one of my theories is it's supposed to be a nametag but it's not registering? Even with the 4 monster dungeons, nether fortresses, and villages I've scavenged through, there hasn't been a single nametag found in the chests.