Skript Version: Skript 2.4.1
Skript Author: Bensku
Minecraft Version: 1.15

Full Code:

Code (Text):

1. on projectile hit:
2.     if projectile is an arrow:
3.         if shooter is a player:
4.             if {perk.explosive.%shooter%} is true:
5.                 wait 3 seconds
6.                 create an explosion of force 3.5 at location of projectile
7.                 delete projectile

I don't understand why the script isn't reading "if {perk.explosive.%shooter%} is true:" as I broke it down piece by piece to see what the error was followed by this code that works. The projectile is shot, hits anything, and doesn't explode.

Code (Text):

1. command /pk [<text>]:
2.     trigger:
3.         if arg-1 is "clear":
4.             [code]
5.         if arg-1 is "explosive":
6.             if {perk.slot.%player%} is true:
7.                 send "&cOnly one perk can be active at a time!" to the player
8.                 stop
9.             if {perk.slot.%player%} is false:
10.                 if player has permission "perk.perk.earrow":
11.                     send "&aExplosive Arrows perk activated!" to the player
12.                     set {perk.slot.%player%} to true
13.                     set {perk.explosive.%player%} to true
14.                     set {perkslot.slot.%player%} to bow named "&bExplosive Arrow"

I did a smaller scale test of this code and it works fine. I've been scratching my head since there's no console errors or skript errors.

Code (Text):

1. command /test:
2.     trigger:
3.         if {perk.explosive.%player%} is true:
4.             send "This works" to the player

Have you tried searching the docs? Yes
Have you tried searching the forums? Scrolling through I haven't seen it
What other methods have you tried to fix it? Tried setting different "if" statements and taking out lines. Adding a 'Send "This should work" to the shooter' line to see what line it's not picking up. Worldguard is installed and I tried setting the region to creeperexplosion allow, otherexplosion allow, and tnt allow