world gen bug

[MrSpy]

i think i found some kind of error in the world gen at about 5900 blocks positive out the x axis there is this weird kinda wall made only from dirtblocks on top of each other to the wall hits the water surface and it follows the z axis for more then 9000 blocks positive, seed is 2760168071569914062.

other image
imgur.com/4CqYH

Edit:
its called ocean when i look at the biome inf3 mode

 

[RampantPanda65]

I believe that is a biome from ExtraBiomesXL. It's the marsh biome.

 

[slay_mithos]

it indeed is, and before you post a second from the caves bellow, it does strange things down there too, adding grass blocks at random.