Phantoms do not drop their exp in the place where they die

When a Phantom is killed, its drops fall in another place rather the same place where they die. And like many drops that fall from high above they do fall scattered to the ground and it's annoying to gather.

From the comments:

Steps to Reproduce:

1. Wait 4 days and 4 nights for a phantom to spawn OR /summon phantom ~ ~20 ~ (summon a few)
2. Kill the phantoms, preferably (but not required) with a Smite V axe or anything that one-shots them.
3. Watch for XP drops.

Observed Results:
The XP drops from a seemingly random place nearby. Phantom membranes drop as expected from the phantom's death location.
YouTube video

Expected Results:
The XP drops from the phantom's death location, as does the phantom membranes.