Can't place Command Blocks

Hello there!

I'm trying to set up a custom PvP map and I thought using command blocks to make it somewhat automatic for the players when they join. The thing is that I can't place them and when I replace any block to a command block with worldedit, it doesn't work.

My server isn't cracked and it's for the Minecraft version 1.16.5. (Paper/Bukkit)

It currently has 25 plugins, which are:

- Advanced Portals

- AutoMessage

- Clearlag

- CMILib

- EssentialsX

- EssentialsX AntiBuild

- EssentialsX Protect

- EssentialsX Spawn

- EssentialsX Chat

- EssentialsX GeoIp

- GriefPrevention

- HolographicDisplays

- Jobs5.0.0.6

- LockettePro

- LuckPerms

- Multiverse Core

- OldCombatMechanics

- PlaceholderAPI

- PlayerReport

- ProtocolLib

- PvPManager

- Scoreboard Revision

- SimpleRTP

- StaffChatReloaded

- SuperVanish

- TabListPro

- UltimateHomes

- Vault.jar

- WorldEdit

- WorldGuard

Quote from DaTrueSheep

It might be becuase commandblocks are disabled or you're not in creative/opped.

I have Command blocks enabled and I'm in creative mode.

Quote from DaTrueSheep

Hmm maybe you're not opped. It also might be a plugin.

I tried to Op myself and the command blocks seem to work, but I don't want to be Op just to use the command blocks. It might be a setting from one of the plugins.