sender's display name returns none

[rudde0]

Description

I think there's conflict with display name of player expression.

Steps to Reproduce the Problem

command /hello:
	trigger:
		send "Hello %(sender).getDisplayName()%&r!"
		send "Hello %display name of sender%&r!"

The code above, if you use skript-reflect, first send effect will send "Hello display name of player!" but second one will send "Hello <none>!"

Specifications

Skungee Version: Tested with BETA-3 and BETA-5
Proxy Platform and Version: Paper environment (standalone test server)
System/Panel (if applicable):