Main Problem

Many Servers/Plugins/Mods utlize their own commands, some of which take the alias of the default minecraft ones. Because of this many plugins make the vanilla commands under: /minecraft:*. The main plugin I know that does this is EssentialsX.

Examples:

/minecraft:summon
/minecraft:give
/minecraft:data

How to fix:

Simply allow the command syntaxes to require either just:
/[Command]
or
/minecraft:[Command]