Information

Full output of /ess version:

Server version: 1.14.4-R0.1-SNAPSHOT git-Paper-137 (MC: 1.14.4)
EssentialsX version: 2.17.0.5
Vault version: 1.7.2-b107

Server log: https://gist.github.com/Whist34/a266faa1531df2e8715fefeeb96e4bb8

EssentialsX config: https://gist.github.com/Whist34/b521bb79636318adae8b43b9a3d76852

Details

Description
Without EssentialsX installed:
Player steps on a pressure plate and a command block issues a command to give the player a jungle_boat and the player receives a jungle boat.

With EssentialsX installed:
Player steps on a pressure plate and a command block issues a command to give the player a jungle_boat, but EssentialsX reports an error and no boat is given.

Console output:
CommandBlock at 574,68,-895 issued server command: /give @p minecraft:jungle_boat
[Essentials] Error calling the command /give
java.lang.Exception: §4Unknown item name: minecraft:jungle_boat.
...

Steps to reproduce
Login
Step on pressure plate
Command block issues server command: /give @p minecraft:jungle_boat
Error

Expected behavior
Player receives a jungle_boat

You can't use minecraft:itemname codes with Essentials' /give command. You'll need to use one of Essentials' shortnames. To find a shortname you can hold an item in your hand and type /itemdb, which will list all the names you can use.

In addition, Spigot no longer allows non-vanilla commands to use selectors (@p, @r etc.) on 1.13+, so this wouldn't work unless you were using the vanilla /minecraft:give command. It's possible to restore functionality using plugins like PsudoCommands or CommandHook.

I am closing this issue. I found a forum thread that discussed the @p issue and how to correct it by using the /minecraft:give command instead of /give.