I generated 5 worlds and looked at them with the developer tool. (3 after updating and 2 after reinstalling)
For everything but the starting area no entities are generated, with which I mean: morbs, pufts, steam geysers, the new plant (wheeze-wort or similar) and other stuff i might not remember. But at least one world had a void (not in the starting area).
Steps to Reproduce
generate world -> be sad
This issue has not been confirmed by a developer yet.