It seems some additions to our registries are now exposing the fact our BEWLRs are not registered in a server-friendly way for 1.18.2. We can probably keep the abstraction for how they're registered with blockitems, but they might need to be moved out of the constructors to a client-side registry that handles the BEWLR registration after the fact, like putting a method in AetherRenderers which can have calls like AetherBlocks.INCUBATOR.setBEWLR(...). (Need to get the block asItem() and cast to EntityBlockItem; might be able to use an interface for all the blocks with custom item renderers to streamline this process).

Closed by #524.