Reported already by someone else, but had the same bug so here's my logs in case they help at all.
and as another user said "you just have a hole in the bottom of the abyss" no, I do not, I checked thoroughly.
Bug Description: Abyss, and Sulphourus sea are completely empty on GFB World
Unsure on causes
Multiplayer: yes
Win 10
Does your computer have a dedicated graphics card: yes
How many GB of RAM do you have: 32
Logs Attached.