So, i built a endermen xp farm in my minecraft survival singleplayer world based in this design https://www.youtube.com/watch?v=tMgBbvH7AhY that's the link for the build, at first i saw part of the video and build it from my memory and knowledge because i've built this design a few times before and the issue was that the endermen were teleporting on leaves (wich i used to build, because of the transparent block and stuff) and i thought that it was pretty weird because endermen keep teleporting behind me and as far as i know enderman can teleport in a range of 32 blocks and only in solid blocks.

Then i thought maybe i have to re do the whole farm following the exact same instructions of the video because i don't want to make a report before making sure that things are running as it should.

So the problem here is that enderman shouldn't teleport on leaves and i think that this happening is a bug

In order to reproduce the bug you can follow this video instructions and it should "work" i think
https://www.youtube.com/watch?v=tMgBbvH7AhY

Hoping i made myself clear i wish you reading this have a pretty good day^^