I only just started playing Subnautica, so started fresh with the March update, no updates since then. I tried your suggestion, Molecular. It didn't work for me, but what did work was to copy the according baked-batch-cells file from the SNUnmanaged…
Have you solved the issue or has it been fixed, Moleculor? I'm having the same problem with the latest stable build, the second time now. It makes the game unplayable as everything outside of a certain radius is just gone.