Minecraft wiki entry for Fish_farming, associated text: Snapshot 20w12a changed how fishing worked. Now, in order to get treasure loot, the bobber will need to be in a 5x5x4 area of water, air, or Lily Pads.. This broke all old AFK fishing designs. The current designs use a timer to approximate how long it'll take to catch a fish, and then forcefully cause the player to reel it in via trapdoors activated on a redstone timer. These aren't as fast as the pre-1.16 designs.