2k world which is 100% explored. Re-explored 80% of the map since the update and no tar slicks or rainbow jellyfish.
Shows up: Crocodog / Cormorant / Roe
Not showing up: Rainbow Jellyfish / Tar Slick
Steps to Reproduce
Use explored world from before the update.
Status: Known Issue
We are aware of this issue and have it logged internally but either we do not have a fix ready yet or we are not planning on addressing the issue in the immediate future.