You can't fish in snapshot 20w18a. When you catch something, bites, and you need to click right mouse button to catch, every time you click - instead of catching whatever bit, the casting line gets deeper underwater. As in when something bites and goes down then up, but happens every time when you click during the catch window. I tryed it in rivers and oceans with normal fishing rods, Lure III enchanted rods, in multiple random seed worlds. Occurs every time. Only lets you pull when the fish escapes, or isnt there.