[InsainArcaneBirdbrain]

Sidenote, the fact you can't fish in with those wall tiles inbetween there is kind of annoying but I can confirm you still get credit for the quest by fishing horizontally off to the side you can start to see in the image. It's a larger range than you think.

Ah, I never tried that admittedly since I already had the stamp on my active characters from before the map change. Guess that makes the problem a bit less severe, but still annoying for those who aren't aware of the workaround.