The world generator setting can't be save in my environment.

[ExerciseBook]

Here is my conduct:

1. /world create -m terrafirma:Test-Myflat Test-MyFlat
2. Restart the server
3. In the border of the generated chunks, it will turn in to the default setting for the newly generated chunks.

My environment:

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Nucleus Diagnostics
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This file contains information about Nucleus and the environment it runs in.
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Environment
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Minecraft Version: Minecraft 1.12.2
Sponge Version: SpongeForge 1.12.2-2768-7.1.5
Sponge API Version: SpongeAPI 7.1.0-366290f8
Nucleus Version: 1.11.0-S7.1 (Git: c1cd9ab0)
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Plugins
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Minecraft (minecraft) version 1.12.2
Minecraft Coder Pack (mcp) version 9.42
Forge Mod Loader (FML) version 8.0.99.99
Minecraft Forge (forge) version 14.23.5.2768
Vivecraft Forge Extensions Core (vivecraftforgeextensionscore) version 0.2.4.13
SpongeAPI (spongeapi) version 7.1.0-366290f8
Sponge (sponge) version 1.12.2-7.1.5
SpongeForge (spongeforge) version 1.12.2-2768-7.1.5
OpenModsLib Core (openmodscore) version 0.12.2
AppleCore (applecore) version 3.2.0
Just Enough Items (jei) version 4.12.1.217
AppleSkin (appleskin) version 1.0.9
Biomes O' Plenty (biomesoplenty) version 7.0.1.2439
Bookshelf (bookshelf) version 2.3.570
Chameleon (chameleon) version 1.12-4.1.3
Chisel (chisel) version MC1.12.2-0.2.1.35
Redstone Flux (redstoneflux) version 2.1.0
CoFH Core (cofhcore) version 4.6.2
CoFH World (cofhworld) version 1.3.0
CraftTweaker2 (crafttweaker) version 4.1.19
CraftTweaker JEI Support (crafttweakerjei) version 2.0.3
Dynmap (dynmap) version 3.0-beta-5-Dev
Grappling hook mod (grapplemod) version 1.12.2-v11.1
Iron Backpacks (ironbackpacks) version 1.12.2-3.0.8-12
Iron Chest (ironchest) version 1.12.2-7.0.42.827
JourneyMap (journeymap) version 1.12.2-5.5.4
Mantle (mantle) version 1.12-1.3.3.55
Natura (natura) version 1.12.2-4.3.2.69
OpenModsLib (openmods) version 0.12.2
OpenBlocks (openblocks) version 1.8.1
Pam's HarvestCraft (harvestcraft) version 1.12.2zb
Storage Drawers (storagedrawers) version 1.12-5.3.5
Vivecraft Forge Extensions (vivecraftforgeextensions) version 0.2.4.13
WorldEdit (worldedit) version 6.1.10-SNAPSHOT
PlaceholderAPI (placeholderapi) version 4.4
Nucleus (nucleus) version 1.11.0-S7.1
Terrafirma (terrafirma) version 1.0.1
Universe Guard 2 (universeguard) version 2.17
Total Economy (totaleconomy) version 1.8.1
Twenty Ticks (twentyticks) version 1.1.0
Nucleus Gluon (nucleus-gluon) version 1.0.4
KaroglanSignEditor (karoglansigneditor) version 3.4.1
FlexibleLogin (flexiblelogin) version 0.17.4
LuckPerms (luckperms) version 4.4.26
CraftBook (craftbook) version 4.0-SNAPSHOT

When I try another generator like "/world create -m sponge:skylands SkyLands" . It works properly.. 🤔

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When I use /worlds . In the world list. I see that the Flat World Modifiers shows no modifiers , but the SkyLands world has.

When I try /world create -m terrafirma:example . It works properly.

I modified my modifier name into only lowercase letters and modified my world name into English Letter Only. It works properly. 🤔