You need to manually add the world type in the gui.yml or delete the gui.yml, if you are updating. Otherwise Realms are not possible to select.

Add:
- Realm Feature (World Normal, Nether, End)
- API for external plugins ( https://github.com/TrueMB/RentItWorldsAPI)
- Support for Nether and End Biomes in only biome worlds
- DefaultWorldGamerules.yml - define gamerules on world creation
- new Commands for some GUIs (riw create/worlds/memberworlds/gadgets)
- Allow * perm for unlimited worlds/worldborder limit
- Disable-Advancements-Announcement Config Setting
- MythicMobs Support Location Condition: isRIW
- Teleport Player to the Last Location in PlayerWorld (can be overwritten with the JOIN_AT_SPAWN Setting)
- Permission to limit MaxPlayers
- ATTACK_PLAYER User Permission and improve attacker detection
- INTERACT_AT_ENTITY to deny or allow interacting with Entities
- ATTACK_ENTITY to deny or allow breaking Armorstands/ItemFrames/etc
- %riw_world_id% Placeholder
- Delete Command to delete own worlds without needing an admin permission

Fix:
- Improve Respawn Location
- Set Build/Place a higher Prio and more forceful
- Prevent Nether/End teleports on PlayerWorlds, which are not realms
- Error on /riw reload
- WorldBorder not getting correctly set after Server Restart
- WorldOnly Gadget change error
- Next Site Button in GUI wasn't working correctly
- Main Menu didn't show back site item
- NPE after extending WorldBorder for an unloaded world
- Improve World Loading Queue and fix unloaded world errors
- Don't load worlds on server start, if unloaded feature active
- Improve World Settings loader and fix Issues
- Error after back up/deleting unloaded world