Both the Essentials and the HeroChat AFK commands reveal player in dynmap.

They're not using AFK. Essentials AFK turns on automatically after 5 minutes.

Well that's unfortunate. Perhaps disable the essentials/dynmap integration. :/

If your vanished players are using /afk while invisible, that's not too bright. There isn't really a way for me to override that, so you should tell your vanished users to not use /afk

There's no config option for that in Dynmap. How about an option to disable AFK while hidden?

It may be an option in Essentials.

There's no options for hidden or invisible players in the Essentials config.

Well, sounds like a feature request for the Essentials team. :(

What you should request: If a player is marked "hidden" in Essentials, the dynmap hook should hide them from the map, and not reveal them such as in the AFK system.

I shall take this issue up with them, then. Thanks!