Skeleton clone not looping through SlimeChunkSection's correctly

[ThatForkyDev]

Describe the issue
Cloning worlds other than an overworld doesn't seem to work, tried NETHER and THE_END, and both result in the same problem being thrown

https://paste.tridentgames.net/uhuvepuwib.md

Spigot version
1.20.1 (https://discord.com/channels/741733106930810950/741741550383398942/1133799086861062226)

Plugin version
https://discord.com/channels/741733106930810950/741741550383398942/1133799086861062226

How to reproduce
/swm clone-world tesing_nether nether_test mongodb

Crash reports (if available)

Nether file (before migrating):

• https://cdn.tridentgames.net/u/NMYjGG.slime

worlds conf:
testing_nether:
source: mongodb
spawn: 0, 128, 0
difficulty: peaceful
allowMonsters: true
allowAnimals: true
dragonBattle: false
pvp: true
environment: nether
worldType: DEFAULT
defaultBiome: minecraft:crimson_forest
loadOnStartup: true
readOnly: false

[kyngs]

I can't replicate this on 1.20.4.

@ThatForkyDev Can you please verify that this issue is still relevant on the latest build of develop?

Here's my config btw:

    nether_test:
        source: file
        spawn: 0, 49, 0
        difficulty: peaceful
        allowMonsters: true
        allowAnimals: true
        dragonBattle: false
        pvp: true
        environment: nether
        worldType: DEFAULT
        defaultBiome: minecraft:plains
        loadOnStartup: true
        readOnly: false
    nether_test2:
        source: file
        spawn: 0, 49, 0
        difficulty: peaceful
        allowMonsters: true
        allowAnimals: true
        dragonBattle: false
        pvp: true
        environment: nether
        worldType: DEFAULT
        defaultBiome: minecraft:plains
        loadOnStartup: true
        readOnly: 

nether_test2 is a clone of nether_test cloned using the /aswm clone-world comand