The Bug

Edit: Please report this bug as Invalid as I accidentally had doMobLoot as false. I am very sorry for the inconvenience.

Ever since snapshot 24w18a, mobs killed do not drop any experience or their usual drops at all.

See the videos attached. I do not have any datapacks installed, and both are vanilla unmodified instances.

How to Reproduce

1. In 1.20.6, spawn a mob that drops something commonly (like a cow), and kill it. Note how it drops experience and sometimes drops its usual drops.
2. In snapshot 24w18a, spawn a mob again as before and kill it. Note how it does not drop any experience or drops, no matter how many times you try.

Additional Notes

In the videos, I killed the mobs with my fist. This is because I thought that only then would mobs not drop anything. However, they do not drop anything even when killed with a weapon.

I have the Strength effect in the videos to allow me to quickly kill the mobs. However, I have confirmed that mobs still drop nothing, even without Strength.

Found while testing MC-271499 and MC-271391.