Very sadly to say that due to the inconsistency of Mojang patches between spigot and paper, Rabbit pet does not work and will occur error when you using spigot server. (switch to paper or wait for spigot to update)

Bug Fixes

• Fixed ISSUES-862 - ClassNotFoundException error occurred while using cowboy gadget. (For 1.17)
• Fixed an issue where the movement path of the mobs for Necromancer Suit ability was incorrect.