Creative saved inventories can be transferred from single player worlds to servers

So I'm not 100% sure this is a bug but it seem kinda strange that creative saved inventories are able to transfer from single player to servers.

A member on my server was handing out items that he enchanted really high from their single player world and saved it as a separate inventory for creative. They then came to my server which has a creative world and started handing those items out to other players on the server.

I'm worried that items that are handed out could cause players to crash by having either really high enchants or potentially running a command if given to an appropriate player with permission for that command.