I lost my world and needed to make a new save after getting into the beta test version of Mistlands. My new save I opted in to the "last stable version before Mistlands" and it works fine.
I decided to opt into "none" of the betas assuming that this is a more up to date version of the game, but is that not true? I can't make "none" work. I want to play with the new build pieces from the Mistlands update if possible and thought they might be in "none". Are they not?
I do have Mods on the game including BepInEx. I have disabled all the mods except BepInEx and I have upgraded it to the latest version.

I get this error message (that it won't let me paste in here) with multiple lines of errors.
[Error: Unity Log] MissingMethodException: string UTils.GetSaveDataPath()
Stack Trace:
UnityEngine.GameObject:AddComponent(Type)
BepInEx.Bootstrap.Chainloader:Start()
UnityEngine.UI.Image:OnCanvasHierarchyChanged()