"player is not whitelisted" is not working?

[AyhamAl-Ali]

Discussed in #6299

^{Originally posted by udukiukia January 5, 2024}

command /test:
	trigger:
		if player is whitelisted:
			send "member"
		else if player is not whitelisted:
			send "not member"
		else:
			send "error"

Why does "member" appear when the player is on the whitelist, but "error" appears when the player is not on the whitelist?

MC 1.20.2
Skript v2.7.3