Slimes and magma cubes do not jump higher with the Jump Boost effect, although it still reduces fall damage for Slimes. Steps to reproduce Spawn Slime Run command /effect give @e[type=slime] minecraft:jump_boost 60 10 false Now you should see the particle effect, but the slime doesn't...
returnPotionEffectType.INCREASE_DAMAGE; caseINSTANT_HEALTH: returnPotionEffectType.HEAL; caseINSTANT_DAMAGE: returnPotionEffectType.HARM; caseJUMP_BOOST: returnPotionEffectType.JUMP; caseNAUSEA: returnPotionEffectType.CONFUSION; caseRESISTANCE: returnPotionEffectType.DAMAGE_RESISTANCE; caseBAD_LUCK: returnPot...