Missing world entities

So I recently started using MCcreator to make a bedrock version of a mod I developed for Java Edition. So far I've got to say I'm really impressed with the IDE and the features it has. I've noticed something weird while testing my mod, to cut a long story short entities that should be added to the world by my mod aren't appearing in the world. More specifically, 2 custom ore types and a custom mob aren't appearing in the over world, nor are their instances found in the creative mod tabs. The custom items I made for the mod are appearing in creative mod so I'm somewhat confused. Any feedback would be appreciated.