What's the issue you encountered?

[01:22:20] [Server thread/WARN] [ne.ne.ne.se.ServerLifecycleHooks/]: Detected minecraft:ocelot that was registered with CREATURE mob category but was added under MONSTER mob category for biomesoplenty:rainforest biome! Mobs should be added to biomes under the same mob category that the mob was registered as to prevent mob cap spawning issues.
[01:22:20] [Server thread/WARN] [ne.ne.ne.se.ServerLifecycleHooks/]: Detected minecraft:ocelot that was registered with CREATURE mob category but was added under MONSTER mob category for biomesoplenty:rocky_rainforest biome! Mobs should be added to biomes under the same mob category that the mob was registered as to prevent mob cap spawning issues.

How can the issue be reproduced?

Run dedicated server with:

NeoForge 1.21.4-21.4.51
BiomesOPlenty-neoforge-1.21.4-21.4.0.19.jar

Logs

No response

Mod Version

1.21.4-21.4.0.19

Additional information

No response

Ocelots spawn under the Monster category in the vanilla Jungle, so we're just copying that behavior. IIRC it spawns way too many of them if they spawn in the Creature category.