Aggressive zombie pigmen giving xp from death

So I have been trying to find any information when this bug was added since in minecraft version 1.1 Java edition the aggressive pigmen do not give xp when killed by a cactus but in few of the newest for example they do.

 

 

 

Ps. couldn't include the correct version and sorry if this is not the right place to ask for this but I didn't come up with any place other.