Hello! Thank you for taking the time to read and respond to my report.
I figured out the problem! It was, in fact my fault. The method I used to kill the phantoms was faulty. I used an iron sword with fire aspect. Killing it with that tool made it not drop any loot; i'm not sure why. I haven't seen this problem anywhere else. But, killing them with a different iron sword that didn't have fire aspect gave me loot.
Edit: Alright, wait, I went to my brother who has Java edition v1.13.2, on a P.C.
He tried killing multiple phantoms with a fire aspect enchanted iron sword on creative. Hitting the phantom 2 times, then letting the fire finish it off in a slow burn yields no loot, but does give exp. That was what I was doing to kill the phantoms on the Xbox.
Killing it with three hits, no slow burning, however, does give both Phantom Membrane and exp.
We did these same methods with another un-dead mob, the zombie. It drops loot and exp with both methods.
This is long , i'm sorry. Thank you very much for helping me.
How do I customize the speed and jump? The attributes won't work for me anymore.
Ahh thank you so much!
Alright then. I appreciate you looking into this!