My apologies, I did not specify that I am using a ‘Water Body River’. To be even more specific, the river goes from one end of the landscape to the other with a few twist and turns throughout.
Instead of the ocean, are you able to try the river please? I have tested the ocean locally (out of curiosity) and that works perfectly.
(UPDATE) I have attempted to try loading both a streamed and non-streamed level to see how it performs. I added a landscape to both and placed a river water body; both levels worked as expected. The level that doesn’t work has a larger landscape and a vast amount of instanced foliage actors. I have tried a variety of fixes including calling the rebuild logic after the world has loaded, after all actors have loaded, after all landscape textures are fully streamed it etc. and still no luck.