Type of bug

Exploit

/ess dump all output

https://essentialsx.net/dump.html?id=bc3bb3b7656f453287380879d5034a75

Error log (if applicable)

No response

Bug description

Players are able to see in several ways if admin is online using /ignore command.

Steps to reproduce

1. Use /ignore nick on player which has * permission or op
2. You can see 2 messages if he is online or 1 if he is offline

Also:
Ignoring player using part of nickname for example admin name is "morkazoid" and I do "/ignore morka" then player see message like player has no vanish

Expected behaviour

Message exactly same like when player is not on the server without any extra messages

Actual behaviour

Two messages (player not found & cannot be ignored) which show players if admin is online and is vanished

I cannot reproduce this. Ignore works regardless of whether the player is online or not, so I don't know where these other messages you're talking about are coming from. Perhaps not Essentials?