Issue reported in [Link Removed] by [Link Removed]
1. Add one component to the 8K Landscape.
2. Adding Ocean will not render correctly.
These can be improved by adjusting Ocean's Collision Extent, Water Zone's Zone Extent, and Extent in Tiles. At first glance, it is difficult to understand.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-175251 in the post.