"You are attempting to publish a world with pre-release features"

This issue has been blocking my progress since February 20, where I made quite a few leaps & bounds in my world. However, I cannot publish it. 

I was told on the discord you can have either all Tri-Mesh or all SubD models. I got rid of the SubD models, and I'm still not allowed to publish said world. A cloned world doesn't make any difference.

Is there a quick way I can get all/any pre-release features out of the world, and thus published? A black box of an error message isn't helping me.