Weird lagbacks on Hypixel

[christopherplaysminecraft]

General Information

Release 4.0.3
Version 1.8.x

Bug Description

I've been experiencing weird lagbacks on Hypixel in Zombies (most notably on the map "Prison") in Murder Mystery as well as in Dropper and BedWars Practice, but weirdly not in BedWars itself. Other modes untested.
Could it be the anti-cheat?

Anyway, one of the most extreme cases I experienced was jumping down in Dropper and not taking any fall damage.

It's been hard to capture, as it happens rather randomly, but from the video it looks like it could have to do with jumping off a block while standing on its edge?

Can be seen at the end of the video.

hypixel-lagback.mp4

Steps to Reproduce

1. Join Hypixel
2. Join BedWars Practice (NPC to the right in the BedWars Lobby)
3. Bridge while making sure to jump off from the edge off a block like in the video

Expected Behavior

Not be lagbacked

[christopherplaysminecraft]

Okay, so this is their new prediction based anti-cheat, which is now also in use in the BedWars Lobby as well as in BedWars itself.

I have heard that it also affects vanilla 1.8 clients, so it is probably the fault of both sides.