You can exploit the teleporting with Essentials through walls.

Example https://youtu.be/ygEnZvwZCz0

You set a home by a liquid.
Teleport to the location.
It teleports you through to the other side.

From the wiki

Adds an option to forcefully disable safe teleportation (very useful for Factions/raiding servers). Mainline Essentials only has two values for the teleport-safety option: to convert locations to safe teleports (results in plenty of exploits) or to deny the teleport entirely. EssentialsX adds a force-disable-teleport-safety option (default false) that when combined with teleport-safety: true, disables conversion to safe locations and teleports the user to their exact location. Note: To disable cross-world teleportation safety, switch to PaperSpigot and set disable-teleportation-suffocation-check to true in paper.yml.

Fixed in #21.