Mobs not Dropping Loot

I have a looting 3 sword. I killed creepers, and no gun powder, squids, and no ink... etc.

What I expected to happen was...

Mobs would drop loot

What actually happened was...:

No loot

Steps to Reproduce:
I don't know what I did to cause this. Using Apex server updated to 1.20.5 and using version 1.20.5.