Minecraft Version

1.21.1

KubeJS Version

2101.7.1-build.181

Rhino Version

2101.2.7-build.74

Architectury Version

No install

Forge/Fabric Version

NeoForge 21.1.141

Describe your issue

### This bug reproduces every time the game is restarted, and I have not yet found a solution.

1.Register a mob_effect_register.js in the startup_scripts folder. In this case, I am using an effect that adds armor value.

2.Use the /effect give command to apply this effect.

3.Check your armor value with /attribute @s minecraft:generic.armor get. If the value remains 0 during the effect's duration, it means the effect is not working. Reapply the effect to yourself and check the armor value again to confirm it takes effect.

Code mob_effect_register.js：

StartupEvents.registry('mob_effect',event=> {
    event.create('iron_skin')
    .beneficial()
    .color('#d1bcad')
    .modifyAttribute('minecraft:generic.armor','kubejs:iron_skin',8,'add_value')
})

Code registry potion_bottle

let $MobEffectInstance = Java.loadClass('net.minecraft.world.effect.MobEffectInstance')

StartupEvents.registry('potion',event => {
    event.create('iron_skin')
    .addEffect(new $MobEffectInstance('kubejs:iron_skin',3600,0))
})

PS：This bug can also be identified by observing the tooltips. If the corresponding potion bottle does not display "When Applied: [Attribute]", it means the modification to the armor value has not taken effect.
https://github.com/user-attachments/assets/949005c4-3e96-4183-a215-9788aa6414d5

Crash report/logs

No response