Unknown attribute 'jump_height'

Summary

Describe the bug encountered in detail.

Steps to reproduce

item configuration. https://pastebin.com/2QcpEFNy

Current behavior

java.lang.IllegalArgumentException: Unknown attribute 'generic.jump_height'

Intended correct behavior

Apply the jumpHeight property to the to item.

Server log file

https://pastebin.com/HqfLagUu

Proposed fixes

It seems to be incorrectly changing JumpHeight to jump_height, when it should be jumpHeight.