Thermos-1.7.10-1614-server
Plugins list:

• LuckPerms-Bukkit-Legacy-2.17.46
• EssentialsX-2.0.1
• EssentialsXChat-2.0.1
• EssentialsXGeoIP-2.0.1
• EssentialsXSpawn-2.0.1
• Vault-1.4.1

I configure permissions and prefixes in yaml. But after you import the file into mysql prefixes stopped check.

fml-server-3.txt

Thanks for reporting :)