This is an old one I guess.
When being vanished and then logging after reconnect one falls through the map and is dead.

I think I'm having the same issue. One of my mods was in Vanish mode, logged off and now he's being kicked for InsideTerrain violation level 200. I accidentally kicked myself while I was in Vanish mode while trying to resolve his issue and now I'm getting the same thing... we spawn in, we're under the map in the water, then we get kicked. 

What can we do?!

Yeah. Falsing that should do it.
Thank you.
Didn't think such thing was set true by default.

I would recommend the "Hide" setting should be set to False by default or removed. I had to restore a backup because when you spawn in under the map, EAC kicks the player. I couldn't find a way to fix this. Luckily my server is low population so reverting to a back up from a few hours prior wasn't a big impact. If I had realized this setting existed, I would have tried changing it to see if it fixed it.

Same issue here.

The "Hide an invisible players body under the terrain after disconnect": true, seems to be working fine and I would actually like to keep it that way to stay safe.

The "If a player was vanished on disconnection keep them vanished on reconnect": true," is also working correctly.

But the "NoClip on Vanish (runs noclip command)": true, seems to be broken, the no clip command is not triggered automatically when spawning and vanishing under the terrain – thus we fall and die if not use a keybind soon enough.

Fixing this QoL issue would do the trick?

Merged post

Made some more testing. With these settings:

"Hide an invisible players body under the terrain after disconnect": true,
"If a player was vanished on disconnection keep them vanished on reconnect": true,
"NoClip on Vanish (runs noclip command)": true,

IF you disconnect while NOT using noclip i.e. you are NOT flying, THEN next time you'll spawn under the terrain, flying in the air i.e. the noclip command will be used correctly

IF you disconnect while actually using noclip i.e. you are flying, THEN next time you'll spawn under the terrain, NOT flying in the air – despite the setting, the noclip command WON'T trigger, thus you'll fall further and die

please fix fall damage too