Opening up UEFN to work on our game this morning and all the water has gone - there is an ominous black rectangle in the sky which dissapears when the water zone is toggled. You can only see it from below - viewed from above it blurs the landscape below. Hiding the water zone hides the rectangle, deleting the water bodies and adding new ones does not fix the issue.
@DubitMike Thank you for your report! We would like to look into this further, would you be able to submit a bug report using the form available here? Fortnite Creative