In 1.15.2 I used DeferredRegister to register all my blocks and items.  In 1.16.1, DeferredRegister is private.  Is this an error and if no, then what is the preferred method to register blocks and items in 1.16.1? public static final DeferredRegister<Block> BLOCKS = new DeferredRegister<>(ForgeRegistries.BLOCKS, MODID);