Some ocean monument generates back side part on the left side
Seed : -6299177223076825039
at this location : x = 5317 y = 52 z = 4774
Some ocean monument generates back side part on the left side
Seed : -6299177223076825039
at this location : x = 5317 y = 52 z = 4774
Cannot confirm for 18w06a, for me it generated correctly.
Can you please try creating another world with the same seed and see if it is the case there too?