Fishing stopped working

I could fish throughout most of the game but at some point after the Taen Quest (I’m not sure precisely when), all my fishing rods stopped working. Whenever it says I’ve caught something, it doesn’t actually start a battle with whatever I caught.

If you’ve caught a delta Remoraid, fishing will no longer work, you’ll have to find the pokemon you’re looking for elsewhere or trade for it

Are they going to fix that in the next patch? I want to get a high levelled Seaking.