MC version: 1.16.2
Minecraft-Enderite-Mod version: 1.2.2-1.16.2

Log entry: [17:40:32] [Netty Client IO #8/ERROR]: Feature: Not a JSON object: "minecraft:enderite_ore_feature";

Yeah, in the moment there is no official way of doing biome features, techreborn and our mod use mixins to fix a problem with registering features. Does the problem only happen if both are active or also if they are seperat?

It occurred if both were separate, too. We blasted away the server and brought installed one mod at a time and tied to one of the Oasis mods. We removed those and so far, so good.