https://github.com/NucleoidMC/nucleoid-extras/blob/5eebab80ce0df8144022c0a58b99eddb9f46860b/src/main/java/xyz/nucleoid/extras/game_portal/ServerChangePortalBackend.java#L77 As a result, the following warning is repeatedly logged to the console: [Render thread/WARN] (Minecraft) Unknown custom packed identifier: bungeecord:main