I asked a few months ago to keep the "_" in the registry name of the blocks we create (ID). But in the latest release 2020.3, when we create or duplicate an element and we put _ in the name, it removes it completely from the mcreator element name, AND from the minecraft registry name (or ID). It's really annoying I need this feature, because when for example we want to give ourself a block from our mod, for example an oak chair, the registry name will be modname:oakchair, and not modname:oak_chair. it's much more readable to have those _. I heard it's a problem for Mcreator to have those _, but why not set the oakchair name for mcreator in the list, but keep the registry name with the _ (oak_chair) for Minecraft? Please add this, it's really ugly to have "oakchair", imagine with much longer names.