I may have used the 'older worlds' out of context. To me, it seems like in any created world before unknown changes, updates, etc., you're able to use an asset as many times as you like, but when you create a new world and try to place the same asset in it, you can't, regardless of an asset update. But much like the media board gizmo in the meta gizmo menu, I can create one in 'older worlds'; however, now I'm no longer able to place a media board in any of my current worlds, whether they're legacy or trimesh worlds.