On release 1.8.X structures generate correctly (5914713286458379401) but when updating this seed to the new snapshots the ocean monuments do not generate.
MC-94317
Structures are not generating correctly
Resolved
Invalid
0
(Unassigned)
Unconfirmed
Minecraft 15w49a, Minecraft 15w49b, Minecraft 15w50a
Retrieved
The spawn algorhithm for Ocean Monuments was in so far changed, that too small biomes now prevent the creation of an Ocean Monument.
In 1.8 it was possible that it would spawn on a 1 x 1 blocks large Deep Ocean.