I also have this problem, though I did not notice it by now on Core Tyria maps; but I saw it right now at VB, and a few days ago in Lake Doric. It's a bit sad I have to decide whether I want to see stange glowing outlines, or turn the Post processing off. Currently I tell myself Tyria has a problem with glowing algae getting washed on the shores, and this is why the water-body-outlines are glowing green and blue 😉
I hope nonetheless it gets fixed soon.