Minecraft 1.20.1
Forge 47.4.2
Mods:
Alex's Caves
Alex's Mobs
AmbientSounds
Amendments
AppleSkin
Architectury
Artifacts
Ballistix
Balm
Better Advancements
Better McDonald's Mod
Biomes O' Plenty
Butcher
CFM Refurbished: Circuit Breaker
Cherished Worlds
Citadel
Clay Soldiers
Cloth Config v10 API
Cobble For Days
Comforts
Controlling
CosmeticArmorReworked
CraftTweaker
Create
Create Crafts & Additions
Create: Copycats+
CreativeCore
Cupboard utilities
Curios API
Daffa's Arsenal
Disx
Dynamic Electricity
Ecologics
Electrodynamics
Elite X Quality Guns
Embeddium
Entity Model Features
Entity Texture Features
EntityCulling
Essential Mod
EyeMod
FTB Essentials
FTB Library
Farmer's Delight
Ferrite Core
Framework
GeckoLib 4
GlitchCore
Gpu memory leak fix
Gucci & Vuitton Attachments
ImmediatelyFast
Immersive Vehicles (MTS/IV) - New Cars By XCEV
Immersive Vehicles (formerly MTS)
Iron Chests: Restocked
Iron Furnaces
Jade
Joban Client Mod
Journeymap
Just Enough Items
Kiwi Library
Kotlin for Forge
LesRaisins Tactical Equipments
LesRaisinsAddon
Lexiconfig
Lightman's Currency
Lightman's Currency Tech
LionfishAPI
MapFrontiers
Mekanism
Mekanism Covers
Mekanism Extras
Mekanism Turrets
Mekanism-MoreSolarPanels
Mekanism: Additions
Mekanism: Generators
Mekanism: Tools
Memory Leak Fix
Mighty Mail
Minecraft Comes Alive
Minecraft Transit Railway
Model Gap Fix
ModernFix
Moonlight Library
Mouse Tweaks
MrCrayfish's Furniture Mod: Refurbished
Nature's Compass
NetherPortalFix
No Chat Reports
NotEnoughAnimations
Nuclear Science
Oculus
Packet Fixer
Panda's Falling Tree's
PandaLib
Patchouli
Polymorph
Resourceful Lib
Resourcefulconfig
Resourcify
Searchables
Serene Seasons
Simple Planes
Simple Radio
Simple Voice Chat
SmartBrainLib
Smoothchunk mod
Snow! Real Magic!
Sophisticated Backpacks
Sophisticated Core
Sophisticated Storage
Sound Physics Remastered
Superb Warfare
Supplementaries
TACZ-addon
TaCZ:Labs
TerraBlender
The Twilight Forest
Timeless & Classics Guns: Zero
Tough As Nails
TrafficCraft
Voltaic
Waystones
WorldEdit
Yeetus Experimentus
YetAnotherConfigLib
[Tacz] NPCs
cataclysm
chisels-and-bits
meds and herbs
spark
taczplus

Other Players on this Server Cannot Create Global Frontiers. This used to work in another World With an Older Version

Saw your comment now, it was the F8 Permission thingy

Make sure the server and client have the same version. By default, only those with OP permissions can create global frontiers. Are the other players OP? If not, you need to give them global frontiers permissions in the F8 settings screen.