Nametags on Animals + Named items in anvil don't render on realms

When I named my dog and when I had renamed shulker boxes in an anvil, the actual names don't show up. Instead of my dog being named "Fredrick" my dog is named "#######." It's incredibly inconvenient, especially when the same issue is present with renamed items. I named a shulker box "Mining Box" and its called "#########."