Is your feature request related to a problem? Please describe.
Yes, players on a server can pick up custom NPCs and wander off with them.

Describe the solution you'd like
Easy NPCs cannot be picked up or moved from the spot they are placed on unless you are in creative.

Additional context
This is in 1.18.2 in our modpack Cosmic Magitech. I would expect that this is a problem in any other modpack that has ways of picking up mobs or villagers via mods.

Releated pull request to add easy_npcs to the forbiddenEntities list:

• Tschipp/CarryOn#468
• Tschipp/CarryOn#469

Thanks a lot for the report, I assume that you have issues with the CarryOn mod.
I added two PRs to add the easy npcs entities to the correspondig forbidden list.

In the mean time please use the CarryOn config carryon-server.toml to add the NPCs to the block list.

[blacklist]
  ...
  #Entities that cannot be picked up
  forbiddenEntities = [..., "easy_npc:*"]
  ...